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Adv. Geosci., 14, 281–286, 2008 www.adv-geosci.net/14/281/2008/ © Author(s) 2008. This work is licensed under a Creative Commons License. Advances in Geosciences Natural hazards for the Earth’s civilization from space, 1. Cosmic ray influence on atmospheric processes L. I. Dorman Israel Cosmic Ray & Space Weather Center and Emilio Segre’ Observatory, affiliated to Tel Aviv University, Technion and Israel Space Agency, Qazrin 12900, Israel Cosmic Ray Department of IZMIRAN, Russian Academy of Science, Troitsk 142092, Moscow Region, Russia Received: 4 July 2007 – Revised: 30 December 2007 – Accepted: 2 January 2008 – Published: 10 April 2008 Abstract. In this paper we give a short description of global natural disasters for the Earth’s civilization from space: 1) Galactic and solar cosmic ray (CR) influence on the atmospheric processes; 2) Impacts of great space magnetic storms during big Forbush-effects in CR, 3) Impacts of great radiation hazards from solar CR during flare energetic particle events, 4) Great impacts on planetary climate during periods of the Solar system capturing by molecular-dust clouds, 5) Catastrophic disasters from nearby Supernova explosions, and 6) Catastrophic disasters from asteroid impacts on the Earth. Some of these problems have been already studied (see e.g. Dorman, 1957, 1963a, b; Dorman and Miroshnichenko, 1968; Dorman, 1972, 1974, 1975a, b, 1978; Velinov et al., 1974; Miroshnichenko, 2001, 2003; Dorman, 2004, 2006, 2008). We present here a detailed treatment of the first disaster only, leaving to future papers the analysis of the other aspects. 1 Introduction The main natural disasters for the Earth’s civilization caused by space phenomena are the following: Space natural disaster 1. Cosmic ray (CR) influence on the air ionization, nuclear and chemical reactions, on global atmospheric processes, on communication systems, on low cloud covering, and on global climate change. This type of space natural disaster will be considered in the present paper. Space natural disaster 2. Global disaster from great space magnetic storms connected with big CR Forbushdecreases and their assessment by using the world-wide network of CR stations: great geomagnetic storms may affect adversely global technology systems, high frequency radio communications can be disrupted, electric power distribution grids blacked out when induced currents causes safety devices to trip, and atmospheric warming causes increased drag on satellites and anomalies in their operation. Moreover, increased frequency of myocardial infarction, brain stroke, car and train accidents have been observed during these events. Electric power and long oil tubes catastrophes have been observed in the past in Canada and other countries. By using on-line hourly CR data from the world-wide network of stations, it is possible to perform an accurate assessment of this natural hazard 15–20 h before the storm sudden commencement. Space natural disaster 3. Global natural disaster from intense radiation hazards for astronauts, for crew and passengers on regular airline flights at the altitude of about 10 km), and occasionally also for people on the ground level due to exceptional solar CR events. It was shown (References) that the predicted occurrence of such events (statistical distribution, examples from the past; we show that this advertisement, with high occurrence probability, can be given 30–60 min before the arrival of the more dangerous particle flux. This method is based on the well known fact that the main part of radiation hazard in space and in atmosphere is caused by particles with small energy (few hundreds MeV) that reach the Earth 1–2 h after their acceleration on the Sun; on the contrary the relatively small flux of high-energy (≥2 GeV) particles not involved in the radiation hazard, which can be detected by super neutron monitors, reach the Earth much more quickly. Several A few minutes of observation of the first-coming high-energy solar particles can give enough information on intensity, energy spectrum, transport parameters, and source function to make it possible to predict the time-space distribution of radiation hazard in interplanetary space (for astronauts and space-probe technology) and in the Earth atmosphere as a function of latitude (geomagnetic cut-off rigidity) and altitude. Correspondence to: L. I. Dorman ([email protected]) Published by Copernicus Publications on behalf of the European Geosciences Union. 2. CR influence on the air ionization, nuclear and chemical reactions, on radio wave propagation, on atmospheric electrical effects and thunderstorms, on low cloud covering and on global climate change 282 L. I. Dorman: Natural hazards for the Earth’s civilization from space 2.1. Air ionization by galactic CR Figure 1 shows experimental data of Ermakov et al. (1997) on galactic CR generation of secondary particles and absorption for different cutoff rigidities, and Figure 2 – total ionization of atmosphere by galactic CR (primary and secondary) in dependence of altitude. Figure 1. The absorption curves of CR in the atmosphere at different cutoff rigidities (numbers at the top in GV). The horizontal bars indicate the standard deviations (Ermakov et al., 1997). Figure 2. Th as a function geomagnetic the top in G indicate th (Ermakov et a The planetary at the altitud Usoskin et al. 3 for the year during 1950-2 4. Fig. 2. ion concentration profiles as a function of altitude for Figure 2. The ionThe concentration profiles Fig. 1. The absorption curves of CR in the atmosphere at different different geomagnetic cutoff rigidities (numbers at the top in GV). as a function of altitude for different cutoff rigidities (numbers at the top in GV). The horizontal bars Thecutoff horizontal bars indicate the standard deviations (Ermakov et al., geomagnetic rigidities (numbers at indicate the standard deviations (Ermakov et al., 1997). 1997). the top in GV). The horizontal bars indicate the standard deviations (Ermakov et al., 1997). Space natural disaster 4. Solar system captured by cepted that the Supernova explosions are the main source molecular-dust clouds. The prediction of the interaction of a of galactic CR. At each explosion the average energy trans50 –1051 erg. From this quantity we dust-molecular cloud with the solar system can be performed ferreddistribution to CR is ESE The planetary of∼10 ionization by measurements of changes in the galactic CR distribution can determine the expected frequency of SE in our Galaxy at the altitude of 3 km, calculated by function. From the past we know that the dust from clouds and in vicinity of the Sun and Usoskin et al. (2004), is shown in Figureestimate the probability of Subetween the Sun and the Earth leads to a decrease of so-the year pernova different distances from the Sun, the 3 for 2000,explosions and its timeat variation lar irradiation flux leading to a sufficient decrease of global expected radiation hazard, and its variation with time. It during 1950-2000 is presented in Figure planetary temperature (by 5–7◦ in comparison with 0.8◦4.from was shown that in some cases the level of radiation may ingreenhouse effect). The plasma in a moving molecular dust crease by about 1000 times in comparison with present level, cloud contains a frozen-in magnetic field; this field could reaching levels extremely dangerous for the Earth’s civilizamodify the stationary galactic CR distribution outside the tion and biosphere. By high energy CR measurements by Heliosphere. The change in the distribution function can ground and underground muon telescopes and low-latitude be significant, and it should be possible to identify these neutron monitors on the Earth it is possible to obtain inforchanges when the distance between the cloud and the Sun mation on the source function and diffusion coefficient many becomes comparable with the dimension of the cloud. The years before the real radiation hazard will involve the Earth. continuous observation of the time variation of CR distribuOn the basis of this information it is possible to perform an 3 developing of the radiation tion function for many years should provide the possibility of accurate forecasting on the time determining the direction and the speed of the cloud relative hazard in space and in the atmosphere at different altitudes to the Sun, as well as its geometry. Therefore, one could preand cutoff rigidities (different geomagnetic latitudes), by usdict its evolution in space and determine whether it will catch ing the method of coupling functions. On the basis of the the Sun or not. In the case of high probability of capture, we obtained forecast the Earth’s civilization will have enough could predict the time of the capture and how long the solar time (at least several tens of years) to prepare an alternative system will be inside the cloud. life underground and in special protected buildings, where to live for several hundreds years. Space natural disaster 5. Catastrophic disasters from nearby Supernova explosions. Prediction of the radiation Space natural disaster 6. Catastrophic disasters from ashazard produced by CR particles generated in a nearby Suteroid impacts on the Earth. These catastrophic disasters ocpernova explosion (SE). From the energetic balance of CR curred several times in the past. At present, by modern methin the Galaxy it was estimated that the full power for CR ods of Astronomy, the trajectory of dangerous asteroids can production is WCR ∼3×1040 erg/s. Now it is commonly acbe exactly determined. By the impact between the asteroid Adv. Geosci., 14, 281–286, 2008 at the bars deviati www.adv-geosci.net/14/281/2008/ Figure 3. Calculated equilibrium galactic CR induced ionization at the altitude of 3 km (h = 2 3 in steps of 10 cm (Usoskin et al., 2004). 725 g/cm ) for the year 2000. Contour lines are given as the number of ion pairs L. I. Dorman: Natural hazards for the Earth’s civilization from space 283 per cm -3 Figure 4. Calculated time profiles of the annual ionization at altitude of 3 km (h = 725 g/cm2), induced galactic CR,time for three regions: polar (Rc < ionization 1 GV), mid-latitudes Fig. 4. byCalculated profiles of the annual at alti- (Rc ≈ 6 2 ), induced GV) andtude equatorial (Rc ≈(h=725 15 GV)g/cm regions. Accordingby to galactic Usoskin et al. (2004). of 3 km CR, for three re- wave Velinov et al., 1974; Dorman, 2004). Especially great disruptions in short radio gions: polar (Rc <1 GV), and23, equatorial communications were observed duringmid-latitudes great solar CR (R event at GV) February 1956. In Figure 5 c ≈6 2.2. Airhow ionization by solarwas CRchanging and influence on radio-wave communications we show(R the GV) air ionization during some et bigal.solar CR events in the period ≈15 regions. According to Usoskin (2004). c= Figure 3. Calculated equilibrium galactic CR induced ionization at the altitude of 3 km (h 1989-2001, by Quack et al. (2001) on the basis of data on observed energy spectra 3 computed During great equilibrium induced at 725 g/cm2Fig. ) for 3. the Calculated year 2000. Contour lines galactic are givenCR as the numberionization of ion pairs per cm in solar energetic particle events the air ionization increased by many times, of solar CR. 2 leading to a sufficient influence on radio-wave communications (see Dorman, 1963a,b; -3 of 3etkm steps of 10the cmaltitude (Usoskin al.,(h=725 2004). g/cm ) for the year 2000. Contour lines are given as the number of ion pairs per cm3 in steps of 10 cm−3 (Usoskin et al., 2004). 4 and a particularly powerful rocket, the trajectory of the asteroid could be slightly changed avoiding a catastrophic interaction. 2 2.1 CR influence on the air ionization, nuclear and chemical reactions, on radio wave propagation, on atmospheric electrical effects and thunderstorms, on low cloud covering and on global climate change Air ionization by galactic CR Figure 5. Total ionization during big solar CR events in October 1989, July 2000, and April Fig. 5. Total ionization during big solar CR events in October 1989, 2001(h(Quack Figure 4. Calculated time profiles of the annual ionization at altitude of 3 km = 725et al., 2001). July 2000, and April 2001 (Quack et al., 2001). g/cm2), induced by galactic CR, for three regions: polar (Rc < 1 GV), mid-latitudes (Rc ≈ 6 Figure 1(Rshows experimental data of Ermakov et al. (1997) 2.3. Galactic and solar CR influence on atmospheric chemical processes GV) and equatorial c ≈ 15 GV) regions. According to Usoskin et al. (2004). on galactic CR generation of secondary particles and absorpThis 2.2. problem was considered in detail by Dorman (2004). We show in Figure 6, as an example,al. the(2001) production nitrates thedata Earth’s galactic spectra and solar of CR, and in Airtion ionization by solar CR rigidities, and influence communications for different cutoff and on Fig.radio-wave 2 – total ionization on ofthe basisinof onatmosphere observedbyenergy Figure 7 the reduction of ozone contents during some solar CR events. of atmosphere by particle galacticevents CR (primary and secondary) solar During great solar energetic the air ionization increasedinbydemany times, leading topendence a sufficient of influence altitude. on radio-wave communications (see Dorman, 1963a,b; The planetary distribution of ionization at the altitude of 3 km, calculated by Usoskin et al. (2004), is shown in Fig. 3 for the year 2000, and its time variation during 1950–2000 is presented in Fig. 4. 2.2 Air ionization by solar CR and influence on radio-wave communications 2.3 CR. Galactic and solar CR influence on atmospheric chemical processes This4 problem was considered in detail by Dorman (2004). We show in Fig. 6, as an example, the production of nitrates in the Earth’s atmosphere by galactic and solar CR, and in Fig. 7 the reduction of ozone contents during some solar CR events. During great solar energetic particle events the air ionization increased by many times, leading to a sufficient influence on 2.4 Galactic and solar CR influence on atmospheric nuclear radio-wave communications (see Dorman, 1963a, b; Velinov processes Figure 6. Nitrates production by galactic CR during minimum and maximum of solar activity (correspondingly GCRmax(NOT VISIBLE) and GCRmin) and during some solar CR events in et al., 1974; Dorman, 2004). Especially great disruptions November September 1966,reactions and August of 1972 (Crutzenand et al.,solar 1975).CR in the in short radio wave communications were observed during As1960, result of nuclear galactic great solar CR event at 23 February 1956. In Fig. 5 we show Earth’s atmosphere a lot of cosmogenic stable and radioachow the air ionization was changing during some big solar tive isotopes (3 H, 3 He, 7 Be, 10 Be, 14 C, and others) are proCR events in the period 1989–2001, computed by Quack et duced. The measurements of 10 Be contents in ice columns 5 www.adv-geosci.net/14/281/2008/ Adv. Geosci., 14, 281–286, 2008 Figure 5. Total ionization during big solar CR events in October 1989, July 2000, and April 2001 (Quack et al., 2001). 2.3. Galactic and solar CR influence on atmospheric chemical processes This problem as an 284 was considered in detail by Dorman (2004). We show in Figure L. I.6, Dorman: example, the production of nitrates in the Earth’s atmosphere by galactic and solar CR, and in Figure 7 the reduction of ozone contents during some solar CR events. Natural hazards for the Earth’s civilization from space Figure 6. Nitrates production by galactic CR during minimum and maximum of solar activity (correspondingly GCRmax(NOT VISIBLE) and GCRmin) and during some solar CR events in Fig. 6. September Nitrates production by galactic CR during minimum and November 1960, 1966, and August 1972 (Crutzen et al., 1975). maximum of solar activity (correspondingly GCRmax (NOT VISIBLE) and GCRmin ) and during some solar CR events in November 1960, September 1966, and August 1972 (Crutzen et al., 1975). 5 from Antarctica and Greenland are widely used for determining galactic CR intensity and solar CR events in the past. The content of 14 C in annual wood rings is utilized for determinFig. 7. Percentage decrease of thepressure O3 partialversus pressure air derived fro Figure 7. Percentage decrease of the O3 partial air versus pressure ing exchange processes between atmosphere, biosphere, and pressure derived from the average the periods 7 days before 4 August average of the 7 days before 4 August 1972 and 7ofday centered on 8 and 19 day oceans, as well as CR intensity in past and for dating (wellandlines). 7 day periods centered on 8 and days after the solar the solar CR event1972 (solid According to Heath et al.19(1977). known radiocarbon method). It is important that by cosmoCR event (solid lines). According to Heath et al. (1977). genic isotopes it is possible to find out catastrophic in 2.4.events Galactic and solar CR influence on atmospheric nuclear processes the Earth’s environment in the past (see Dorman, 2004). As result of nuclear of (Chalmers, galactic and solarThis CR discharge in the Earth’s atmosphere a Earthreactions in 5–6 min 1967). is indeed 3 3 7 10 14 cosmogenic stable and radioactive isotopes ( H, He, Be, Be, C, and others) are prod compensated by many thousands thunderstorms and elec2.5 CR influence on atmospheric electric field and thunder10 Be contents in ice columns from Antarctica and Greenland are w The measurements of tron precipitations which are charging the Earth negatively. storms, global Earth’s charge and global electric curused for determining galactic CR intensity and solar CR events in the past. The content A global electric circuit in the low atmosphere is provided rent in annual wood rings utilized for determining exchange processes atmos by CRiswhich, through the ionization of air atoms, assurebetween air biosphere, and oceans, as well as CR intensity in past and for dating (well-known radioc conductivity. Therefore, CR may play an important key role The influence of CR on thunderstorms and atmospheric elecmethod). It is important that by cosmogenic isotopes it is possible to find out catastr in keeping about constant the Earth’s global negative charge tric field was intensively investigated in the frame of kievents in the Earth’s in the past (see Dorman, 2004). (seeenvironment Dorman, 2004). netic theory of discharges by Gurevich et al., 1992, 1999, 2001; Gurevich and Milikh, 1999; Gurevich and Zybin, 2.6 CR on planetary cloud-covering and long2.5. withCR influence oninfluence atmospheric electric field and thunderstorms, glob 2001. It was shown that discharges are not possible term climate change Earth’s charge and global electric current out the presence of CR in the observed atmospheric elecThe elecinfluence of CR on thunderstorms and atmospheric electric field was inten tric fields. Only owed to the secondary CR relativistic Fig. 8ofwe show theory results of of discharges Marsh and by Swensmark investigated kinetic Gurevich(2000a, et al., 1992, 1999, trons, which in the atmospheric electric field create runawayin theInframe Gurevich and Milikh, Gurevich and Zybin,CR 2001. It wasvariation shown that b) on1999; the comparison between intensity anddischarges a electron avalanches, thunderstorm discharges become possipossible without the presence CR in the observed atmospheric electric fields. Only ow variations in of planetary cloud coverage. ble. On the other hand, also Ermakov (1992), Ermakov and thedischarges secondary CR relativistic electrons, the atmospheric field create ru Figure 8 shows that which a veryingood correlation iselectric found for Stozhkov (1999, 2003) connected thunderstorms electron thunderstorm discharges becomecan possible. On the the low clouds. This good correlation be explained by other hand with CR, but they assumed that the main cause are theavalanches, atErmakov (1992), considering Ermakov and 2003) thunderstorms disc the Stozhkov ionization (1999, of air by CR. connected The decreasing of mospheric showers of energetic particles generated by priCR,genbut they causeofare showers of ene CRassumed intensitythat leadstheto main decreasing thethe air atmospheric ionization, causmary CR with energy ≥1014 eV (the frequencywith of their generateding bya primary CRofwith energyclouding ≥ 1014 eV (the frequency of their genera decreasing planetary coverage, and a correeration in a cloud with a dimension of severalparticles km is about a cloud with a dimension several km is about ground 1000/s).airIttemperature. is well known that the Ear spondingof increasing of planetary 1000/s). It is well known that the Earth has about constant 5 about constant negative charge Q shown ≈ 6×10another C. As example a result, of in the quiet conditions In Fig. 9 it is influence of there are e negative charge Q≈6×105 C. As a result, in quiet conditions space effects on the Earth’s climate: variation of air surface there are electric fields of about −130 V/m directed to the temperature during Maunder minimum in connection with Earth’s surface. Between the Earth’s surface and the neutral variation in 10 Be concentration (which is proportional to CR layer in ionosphere at the altitudes of 55–80 km there is a −12 2 intensity). flow of electric current with average density J ≈10 A/m . From Fig. 9 can be seen that again the main cause of the The total discharged current in all atmosphere is about 1800 long-term changes in climate is time variation of CR intenA, and this current may discharge the negative charge of the Adv. Geosci., 14, 281–286, 2008 www.adv-geosci.net/14/281/2008/ atmosphere is provided by CR which, through the ionization of air atoms, assure air conductivity. Therefore, CR may play an important key role in keeping about constant the Earth's global negative charge (see Dorman, 2004). L. I. Dorman: Natural hazards for the Earth’s civilization from space 2.6. 285 CR influence on planetary cloud-covering and long-term climate change In Figure 8 we show results of Marsh and Swensmark (2000 a,b) on the comparison between CR intensity variation and variations in planetary cloud coverage. Figure 8. CR intensity according to Huancayo/Haleakala NM (cut off rigidity 12.9 GV, normalized to October 1965, curve 2) in comparison with global average of monthly cloud coverage anomalies (curve 1) for: a – high clouds, H > 6.5 km, b – middle clouds, 6.5 km >H > 3.2 km, and c – low clouds, H < 3.2 km. According to Marsh and Swensmark (2000a,b). Figure 9. minimum: reconstruc Lean et al 10 Be conce (1991); c) temperatur hemispher (1998). A (2000). From Figu again the term chan variation o increasing air ioniza increasing and corre the air s papers Do (2005) we forecasting intensity determinin climate c influence clouds cov to 11 years Figure 8 shows that a very good correlation is found for the low clouds. This good correlation can be explained by considering the ionization of air by CR. The decreasing of CR intensity leads to decreasing of the air ionization, causing a decreasing of planetary clouding coverage, and a corresponding increasing of planetary ground air temperature. In Figure 9 it is shown another 3 Concl example of the influence of space We presen effects on the Earth’s climate: description variation of air surface temperature natural disastersin for the Earth’s we considered in more during minimum incivilization. Fig. 9. Maunder Situation the Maunder minimum: (a) variation in re10 phenomena influence on atmospheri disaster,with connected withfrom space constructed solar irradiance Beet al. (1995); (b) variation connection variation in Lean 10 Be concentration and solar CR onBeer ionization, nuclear chemical reactions, ingalactic et al. (1991); (c) and reconstructed concentration (which isfrom proportional air surface temperature for the northern hemisphere from Joneschanges. et processes, on planetary cloudiness and global climate to CR intensity). al. (1998). According to Swensmark (2000). Fig. 8. CR intensity according to Huancayo/Haleakala NM (cut off rigidity 12.9 GV, normalized to October 1965, curve 2) in comparison with global average of monthly cloud coverage anomalies (curve 1) for: (a) – high clouds, H>6.5 km, (b) – middle clouds, 6.5 km>H>3.2 km, and (c) – low clouds, H<3.2 km. According to Marsh and Swensmark (2000a, b). sity, and with increasing of CR intensity increases air ionization, which leads to increasing of low clouds covering and corresponding decreasing of the air surface temperature. In papers Dorman (2005), Belov et al. (2005) were developed methods of forecasting the expected CR intensity long-term variation and determining the part of global climate change, caused by CR influence on the planetary low clouds covering (from few years up to 11 years ahead). www.adv-geosci.net/14/281/2008/ References Beer J., G.M. Raisbeck, and F. Yiou “Time variations of 10Be and solar activity”, i Sonett, M.S. Giampapa, and M.S. Matthews, University of Arizona Press, 343 3 Conclusions Belov A.V., L.I. Dorman, R.T. Gushchina, V.N. Obridko, B.D. Shelting, and expected global climate change by7forecasting of galactic cosmic ray intensit based on solar magnetic field data”, Adv. Space Res., 35, 491-495 (2005). We presented in this paper a short Pergamon description of 1967. the main Chalmers J.A., Atmospheric Electricity, Press, space natural disasters for the Earth’s civilization. we conCrutzen P.J., I.S.A. Isaksen, and G.C. 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