- Repository of the Academy`s Library
... intensive research activity in the MHD wave studies, there are a number of comprehensive reviews of different aspects of the topic, see, e.g. Zaitsev and Stepanov (2008); Petrosyan et al. (2010); Banerjee et al. (2011); Patsourakos and Vourlidas (2012a); De Moortel and Nakariakov (2012); Stepanov et ...
... intensive research activity in the MHD wave studies, there are a number of comprehensive reviews of different aspects of the topic, see, e.g. Zaitsev and Stepanov (2008); Petrosyan et al. (2010); Banerjee et al. (2011); Patsourakos and Vourlidas (2012a); De Moortel and Nakariakov (2012); Stepanov et ...
Influence of extreme ultraviolet radiation on the Pv ionization fraction
... on the square of the density. Moreover, the ultraviolet P V resonance lines indicate a possible need for an even stronger reduction of hot star mass-loss rates, provided that P V is a dominant ionization stage of phosphorus, at least in some hot stars. The latter assumption is challenged by the poss ...
... on the square of the density. Moreover, the ultraviolet P V resonance lines indicate a possible need for an even stronger reduction of hot star mass-loss rates, provided that P V is a dominant ionization stage of phosphorus, at least in some hot stars. The latter assumption is challenged by the poss ...
Master`s Thesis
... proxy of the solar EUV flux rate), this project is focused on far stellar flares, thus it may be said that GNSS Stellar Flare Activity Indicator (hereinafter G*FLAI or equivalently GSFLAI) is born here. The results are supported by the comparison of GSFLAI with direct observations provided by GBM an ...
... proxy of the solar EUV flux rate), this project is focused on far stellar flares, thus it may be said that GNSS Stellar Flare Activity Indicator (hereinafter G*FLAI or equivalently GSFLAI) is born here. The results are supported by the comparison of GSFLAI with direct observations provided by GBM an ...
STELLAR SPECTRA A. Basic Line Formation
... – Schwarzschild, Eddington, Milne, Thomas and many others throughout the twentieth century: development of more general line-formation theory, especially radiation transport through resonance scattering; – Avrett, Auer, Mihalas, Hummer, Rybicki and many others, from 1965: application of computers to ...
... – Schwarzschild, Eddington, Milne, Thomas and many others throughout the twentieth century: development of more general line-formation theory, especially radiation transport through resonance scattering; – Avrett, Auer, Mihalas, Hummer, Rybicki and many others, from 1965: application of computers to ...
STELLAR ABLATION OF PLANETARY ATMOSPHERES
... from the Sun, both electromagnetic and mechanical. The term ‘‘geospace’’ is used here in the sense suggested by the NSF Geospace Environment Modeling (GEM) Program, to encompass the coupled atmosphere, ionosphere, magnetosphere, and heliosphere. Over the past 40 years, the SunEarth system has been t ...
... from the Sun, both electromagnetic and mechanical. The term ‘‘geospace’’ is used here in the sense suggested by the NSF Geospace Environment Modeling (GEM) Program, to encompass the coupled atmosphere, ionosphere, magnetosphere, and heliosphere. Over the past 40 years, the SunEarth system has been t ...
8th International Workshop on Planetary, Solar and Heliospheric
... time for dinner at 6:30 PM. The costs for this trip (organized bus transportation, entrance fee at Zotter) are covered by your registration fee. Weather and dress The average high temperature for the south of Styria (Graz, Leibnitz) in October is 16°C (61°F), and the average low temperature is 5°C ( ...
... time for dinner at 6:30 PM. The costs for this trip (organized bus transportation, entrance fee at Zotter) are covered by your registration fee. Weather and dress The average high temperature for the south of Styria (Graz, Leibnitz) in October is 16°C (61°F), and the average low temperature is 5°C ( ...
Response of equatorial-low latitude ionosphere
... line in Figure 3 (see also Figure 2). The short-lived perturbation in Vz over Kodaikanal thus indicates the presence of a transient westward electric field near the nightside dip equator at the time of the preliminary impulse of the si- and an eastward field thereafter. The amplitude ofthe westward ...
... line in Figure 3 (see also Figure 2). The short-lived perturbation in Vz over Kodaikanal thus indicates the presence of a transient westward electric field near the nightside dip equator at the time of the preliminary impulse of the si- and an eastward field thereafter. The amplitude ofthe westward ...
Natural and man-made terrestrial electromagnetic noise
... electromagnetic noise. Within the Non Ionizing Radiation band (NIR), i.e. for frequencies lower than 300 GHz, this background can have a natural or an artificial origin. Natural origins of electromagnetic radiations are generally atmospheric or cosmic while artificial origins are technological appli ...
... electromagnetic noise. Within the Non Ionizing Radiation band (NIR), i.e. for frequencies lower than 300 GHz, this background can have a natural or an artificial origin. Natural origins of electromagnetic radiations are generally atmospheric or cosmic while artificial origins are technological appli ...
Composition Of The Atmosphere
... • We often think of the oxygen that we breathe as being a major part of Earth’s atmosphere, but it’s not. • It’s made up of many different gases, with the main gas being nitrogen. • It’s vital to life on Earth that the atmosphere is mostly nitrogen, because it’s a more stable gas than oxygen. • Oxyg ...
... • We often think of the oxygen that we breathe as being a major part of Earth’s atmosphere, but it’s not. • It’s made up of many different gases, with the main gas being nitrogen. • It’s vital to life on Earth that the atmosphere is mostly nitrogen, because it’s a more stable gas than oxygen. • Oxyg ...
Astrophysics with the Computer: Propagation of Ionization Fronts in
... A hot star is born in an interstellar gas cloud. At first all the gas (hydrogen and helium) is neutral and therefore oprically thick to the ultraviolet (λ < 91 nm) radiation of the star. Where the radiation hits the gas, a layer will be ionised and hence become optically thin. Thus the stellar photo ...
... A hot star is born in an interstellar gas cloud. At first all the gas (hydrogen and helium) is neutral and therefore oprically thick to the ultraviolet (λ < 91 nm) radiation of the star. Where the radiation hits the gas, a layer will be ionised and hence become optically thin. Thus the stellar photo ...
∫ Formation of a Local Atmospheric Electric Field
... at the maximum reaches 30 cm–3 s–1, and the altitude range of the maximum ionization region is 16–10, i.e., about 7 km, which indicates the significant effect of cosmic rays on the integral conductivity. The high sta bility of cosmic ray intensity, except for the Forbush decrease, causes relatively ...
... at the maximum reaches 30 cm–3 s–1, and the altitude range of the maximum ionization region is 16–10, i.e., about 7 km, which indicates the significant effect of cosmic rays on the integral conductivity. The high sta bility of cosmic ray intensity, except for the Forbush decrease, causes relatively ...
Discrimination of exoplanetary and stellar radio flux
... It is due to thermal emission from regions of hot and dense plasma (e.g. over sunspots). It leads to flux density variations of a factor of two in the decimetric and centimetric wavelength range with 27 days period (due to the solar rotation). It is frequently circularly polarized. Noise storms Duri ...
... It is due to thermal emission from regions of hot and dense plasma (e.g. over sunspots). It leads to flux density variations of a factor of two in the decimetric and centimetric wavelength range with 27 days period (due to the solar rotation). It is frequently circularly polarized. Noise storms Duri ...
Upper ionosphere of Mars is not axially symmetrical
... other factors which might influence the upper ionosphere. The induced magnetosphere of Mars is produced by draping of the IMF. Asymmetry in the pile-up observed by Mars Global Surveyor (MGS) (Vennerstrom et al., 2003) can lead to a more effective screening of the ionosphere in the hemisphere in whic ...
... other factors which might influence the upper ionosphere. The induced magnetosphere of Mars is produced by draping of the IMF. Asymmetry in the pile-up observed by Mars Global Surveyor (MGS) (Vennerstrom et al., 2003) can lead to a more effective screening of the ionosphere in the hemisphere in whic ...
THE SUN - University of Mass Lowell, Space Science Laboratory
... Radio Waves in an Ionospheric Plasma A radio wave consists of oscillating electric and magnetic fields. When a low-frequency radio wave (i.e., frequency less than the plasma frequency) impinges upon a plasma, the local charged particles have sufficient time to rearrange themselves so as to “cancel ...
... Radio Waves in an Ionospheric Plasma A radio wave consists of oscillating electric and magnetic fields. When a low-frequency radio wave (i.e., frequency less than the plasma frequency) impinges upon a plasma, the local charged particles have sufficient time to rearrange themselves so as to “cancel ...
Lec 18 - Agro Meteorology - Development of e
... Beginning of the year temperature of the Indian Peninsular rapidly rises under the increasing heat of the sun. A minimum barometric pressure is established in the interior parts of the Peninsular by the month of March. Westerly winds prevail on the west Kerala and south winds on the west of northern ...
... Beginning of the year temperature of the Indian Peninsular rapidly rises under the increasing heat of the sun. A minimum barometric pressure is established in the interior parts of the Peninsular by the month of March. Westerly winds prevail on the west Kerala and south winds on the west of northern ...
Name
... Stratosphere – the second layer of the atmosphere; contains the ozone layer which protects us from too much UV radiation ...
... Stratosphere – the second layer of the atmosphere; contains the ozone layer which protects us from too much UV radiation ...
Lecture Packet#1
... for absorbing the ultraviolet radiation from the Sun. The formation of this layer is a delicate matter, since only when oxygen is produced in the atmosphere can an ozone layer form and prevent an intense flux of ultraviolet radiation from reaching the surface, where it is quite hazardous to the evol ...
... for absorbing the ultraviolet radiation from the Sun. The formation of this layer is a delicate matter, since only when oxygen is produced in the atmosphere can an ozone layer form and prevent an intense flux of ultraviolet radiation from reaching the surface, where it is quite hazardous to the evol ...
The Earth`s Atmosphere
... for absorbing the ultraviolet radiation from the Sun. The formation of this layer is a delicate matter, since only when oxygen is produced in the atmosphere can an ozone layer form and prevent an intense flux of ultraviolet radiation from reaching the surface, where it is quite hazardous to the evol ...
... for absorbing the ultraviolet radiation from the Sun. The formation of this layer is a delicate matter, since only when oxygen is produced in the atmosphere can an ozone layer form and prevent an intense flux of ultraviolet radiation from reaching the surface, where it is quite hazardous to the evol ...
CHAPTER 17
... layer of the atmosphere It’s height ranges from 100 to 400 km This is where most small meteorites burn up and is also the location in the atmosphere that the northern lights occur ...
... layer of the atmosphere It’s height ranges from 100 to 400 km This is where most small meteorites burn up and is also the location in the atmosphere that the northern lights occur ...
docx
... Natural Sources of Radio Waves: Background By now you and your classmates have become familiar with the basics of how electromagnetic radiation transfers energy from one location to another. You may have even practiced generating your own waves by oscillating a current in a wire producing a constant ...
... Natural Sources of Radio Waves: Background By now you and your classmates have become familiar with the basics of how electromagnetic radiation transfers energy from one location to another. You may have even practiced generating your own waves by oscillating a current in a wire producing a constant ...
NASA EPSCoR of Utah minigrant awards
... structures is the Weddell Sea anomaly, which is a phenomenon in which the ionospheric electron densities are larger at night than in the daytime during southern hemisphere summer months. Figure 1 shows an example of the ratio of the nighttime to daytime peak electron densities observed by the COSMIC ...
... structures is the Weddell Sea anomaly, which is a phenomenon in which the ionospheric electron densities are larger at night than in the daytime during southern hemisphere summer months. Figure 1 shows an example of the ratio of the nighttime to daytime peak electron densities observed by the COSMIC ...
Investigation of the Earth Ionosphere using the Radio Emission of
... analytical form for the representation of model signals (Marple 1999). Thus, two independent channels (A and B) were formed in which the simulated pulse signals had an orthogonal linear polarization and PA of a given trend. The resulting signal possessed a given ellipticity coefficient and a specifi ...
... analytical form for the representation of model signals (Marple 1999). Thus, two independent channels (A and B) were formed in which the simulated pulse signals had an orthogonal linear polarization and PA of a given trend. The resulting signal possessed a given ellipticity coefficient and a specifi ...
Particle precipitation influence in the conductivity of the auroral
... from classical equations, by assuming collision frequencies, gyrofrequencies, magnetic field, etc; iv) integrate σP and σH in altitude to determine the respective conductances ΣP and ΣH . However, this physical concept is significantly limited by the practical procedures and assumptions to construct ...
... from classical equations, by assuming collision frequencies, gyrofrequencies, magnetic field, etc; iv) integrate σP and σH in altitude to determine the respective conductances ΣP and ΣH . However, this physical concept is significantly limited by the practical procedures and assumptions to construct ...
Skywave Excitement - Lake Area Radio Klub
... below the Maximum Usable Frequency (MUF) and above the Lowest Usable Frequency (LUF) are bent back to the Earth. (G3B05) A reliable way to determine if the Maximum Usable Frequency (MUF) is high enough to support skip propagation between your station and a distant location on frequencies between 1 ...
... below the Maximum Usable Frequency (MUF) and above the Lowest Usable Frequency (LUF) are bent back to the Earth. (G3B05) A reliable way to determine if the Maximum Usable Frequency (MUF) is high enough to support skip propagation between your station and a distant location on frequencies between 1 ...
Effect of Ionosphere on Radio Wave Propagation
... Radio wave is EM wave that can be reflected, refracted, in the atmosphere like light and heat waves. Simply wave can be defined as disturbance of EM and other wave which move through medium. It is means of transferring energy from one point to another. The all leading wave has amplitude, wave length ...
... Radio wave is EM wave that can be reflected, refracted, in the atmosphere like light and heat waves. Simply wave can be defined as disturbance of EM and other wave which move through medium. It is means of transferring energy from one point to another. The all leading wave has amplitude, wave length ...
Ionosphere
The ionosphere /aɪˈɒnɵˌsfɪər/ is a region of Earth's upper atmosphere, from about 60 km (37 mi) to 1,000 km (620 mi) altitude, and includes the thermosphere and parts of the mesosphere and exosphere. It is distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth.