Solar Weather Event Modelling and Prediction
... trajectories that are realized by nature; despite of that they argue and present physical examples indicating that, in such a case, though the model is deterministic and low dimensional, statistical quantities can still be reliably computed. In a recent work, Woolley et al. (2009) proposed the use o ...
... trajectories that are realized by nature; despite of that they argue and present physical examples indicating that, in such a case, though the model is deterministic and low dimensional, statistical quantities can still be reliably computed. In a recent work, Woolley et al. (2009) proposed the use o ...
ASTRONOMY AND ASTROPHYSICS Properties of solar pores
... visible lines of different formation heights, Thim (1993) finds 3.3 G km;1; the empirical model of Sütterlin (1991) predicts a gradient of 2-3 G km ;1. Theoretical models as well as observations show that the diameter of a pore increases with height in the atmosphere (Simon & Weiss 1970; Zirin & Wan ...
... visible lines of different formation heights, Thim (1993) finds 3.3 G km;1; the empirical model of Sütterlin (1991) predicts a gradient of 2-3 G km ;1. Theoretical models as well as observations show that the diameter of a pore increases with height in the atmosphere (Simon & Weiss 1970; Zirin & Wan ...
Dissipation and heating in solar wind turbulence: from the macro to
... fluctuations at MHD scales is widely shown to be of power-law form with the now famous and ubiquitous Kolmogorov power-law spectra with exponent value of ∼ −5/3. Although, the value of this exponent is still debated among some researchers, much of the phenomenology here is borrowed from neutral flui ...
... fluctuations at MHD scales is widely shown to be of power-law form with the now famous and ubiquitous Kolmogorov power-law spectra with exponent value of ∼ −5/3. Although, the value of this exponent is still debated among some researchers, much of the phenomenology here is borrowed from neutral flui ...
Solar chromospheric flares: energy release, transport and radiation
... is released to dramatic effect. The principal result is the intense burst of radiation that occurs across the electromagnetic spectrum, in association with (and possibly caused by) copious numbers of charged particles accelerated out of a thermal background. Also frequently occurring at the time of ...
... is released to dramatic effect. The principal result is the intense burst of radiation that occurs across the electromagnetic spectrum, in association with (and possibly caused by) copious numbers of charged particles accelerated out of a thermal background. Also frequently occurring at the time of ...
CEA - The Sun
... and an almost zero mass (less than 10 to the power of 33 grams), the neutrino interacts only very weakly with matter. Every second, 65 billion neutrinos strike each square centimeter of the Earth's surface and almost none are stopped! This is why large scale detectors have been constructed, and inst ...
... and an almost zero mass (less than 10 to the power of 33 grams), the neutrino interacts only very weakly with matter. Every second, 65 billion neutrinos strike each square centimeter of the Earth's surface and almost none are stopped! This is why large scale detectors have been constructed, and inst ...
Solar Rotation - Stanford Solar Physics
... The Sun rotates differentially, i.e. the solar rotation rate varies with both latitude and radius. The differential rotation is particularly prominent in the convection zone where equatorial zones rotate almost 30% faster than near-polar regions. There are also strong variations of the rotation rate ...
... The Sun rotates differentially, i.e. the solar rotation rate varies with both latitude and radius. The differential rotation is particularly prominent in the convection zone where equatorial zones rotate almost 30% faster than near-polar regions. There are also strong variations of the rotation rate ...
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... Figure 4 presents the pitch angle resolved electron energy spectra obtained on September 20, 2005 as a function time. Panels A-E display pitch angle ranges 0-30o, 30- ...
... Figure 4 presents the pitch angle resolved electron energy spectra obtained on September 20, 2005 as a function time. Panels A-E display pitch angle ranges 0-30o, 30- ...
The Present Status of Chinese Study of Solar Eclipses
... that occurred during a three-century period, and came up with four possible dates: 2043 BC, 2019 BC, 1970 BC, and 1961 BC. The research group led by Li Xueqin (1999) re-evaluated the famous “three flames eat the Sun” event which is typically associated with a solar eclipse, and found instead that it ...
... that occurred during a three-century period, and came up with four possible dates: 2043 BC, 2019 BC, 1970 BC, and 1961 BC. The research group led by Li Xueqin (1999) re-evaluated the famous “three flames eat the Sun” event which is typically associated with a solar eclipse, and found instead that it ...
release history and transport parameters of relativistic solar
... McComas et al. 2007). The science goals of the next generation of spacecraft traveling close to the Sun (i.e. Solar Orbiter and Solar Probe Plus) include the exploration of the mechanisms that accelerate and transport energetic particles (Fox et al. 2015) as well as the study of how energetic partic ...
... McComas et al. 2007). The science goals of the next generation of spacecraft traveling close to the Sun (i.e. Solar Orbiter and Solar Probe Plus) include the exploration of the mechanisms that accelerate and transport energetic particles (Fox et al. 2015) as well as the study of how energetic partic ...
Propagation of cosmic rays in the solar wind
... Rao et al., 1963] is due to the corotarionof the interplanetary magneticfield with the sun [Ahluwalia and Dessler,1962]. With the introductionand acceptanceof the solar wind conceptand with the recognitionthat fast chargedparticles (particleswith velocitiesmuch greater than the Alfv•n velocity) diff ...
... Rao et al., 1963] is due to the corotarionof the interplanetary magneticfield with the sun [Ahluwalia and Dessler,1962]. With the introductionand acceptanceof the solar wind conceptand with the recognitionthat fast chargedparticles (particleswith velocitiesmuch greater than the Alfv•n velocity) diff ...
The AD775 cosmic event revisited: the Sun is to blame
... Conclusions. The results point to the likely solar origin of the event, which is now identified as the greatest solar event on a multimillennial time scale, placing a strong observational constraint on the theory of explosive energy releases on the Sun and cool stars. Key words. Sun: activity – Sun: ...
... Conclusions. The results point to the likely solar origin of the event, which is now identified as the greatest solar event on a multimillennial time scale, placing a strong observational constraint on the theory of explosive energy releases on the Sun and cool stars. Key words. Sun: activity – Sun: ...
chapter5 - Homework Market
... • Sunspots are regions of the photosphere that appear darker than the rest. • They produce less light than equal-sized pieces of the normal photosphere. • Their color is redder than the average. • From both the Wien and Stefan–Boltzmann laws, you can conclude that they are cooler than the ...
... • Sunspots are regions of the photosphere that appear darker than the rest. • They produce less light than equal-sized pieces of the normal photosphere. • Their color is redder than the average. • From both the Wien and Stefan–Boltzmann laws, you can conclude that they are cooler than the ...
C-14 is used to date
... Sunspots Sunspots are places of intense solar and magnetic activity. With increased solar activity the magnetic field of the sun intensifies, which shields the earth from cosmic rays from the sun. So less C-14 is produced when the sun has a high sunspot population. ...
... Sunspots Sunspots are places of intense solar and magnetic activity. With increased solar activity the magnetic field of the sun intensifies, which shields the earth from cosmic rays from the sun. So less C-14 is produced when the sun has a high sunspot population. ...
The Solar Wind Power from Magnetic Flux
... slower and significantly less dense, cooler, and had less mass and momentum flux than during the previous solar minimum (McComas et al. 2008). The reduction in the ram pressure of ∼20% appears well correlated with the ∼25% reduction in the open flux and measurements in the slower, ecliptic wind indi ...
... slower and significantly less dense, cooler, and had less mass and momentum flux than during the previous solar minimum (McComas et al. 2008). The reduction in the ram pressure of ∼20% appears well correlated with the ∼25% reduction in the open flux and measurements in the slower, ecliptic wind indi ...
Electron and Ion Dynamics of the Solar Wind Interaction with a
... Historically, this process revealed the existence of the solar wind and the interplanetary magnetic field [5–8]. Comets are critical to decipher the physics of gas release processes in space. The latter result in mass-loaded plasmas [9,10], which more than three decades after the Active Magnetospher ...
... Historically, this process revealed the existence of the solar wind and the interplanetary magnetic field [5–8]. Comets are critical to decipher the physics of gas release processes in space. The latter result in mass-loaded plasmas [9,10], which more than three decades after the Active Magnetospher ...
Sample Return from Primitive Asteroids and Comets
... noble gases. Variations are also evident in the wide range of oxidation states recorded among meteorites. These compositional variations were established and maintained over a relatively narrow range of the nebula, which implies the inner nebula was not well mixed. On the other hand, meteorites inco ...
... noble gases. Variations are also evident in the wide range of oxidation states recorded among meteorites. These compositional variations were established and maintained over a relatively narrow range of the nebula, which implies the inner nebula was not well mixed. On the other hand, meteorites inco ...
On the origin of stars with and without planets
... Fig. 1 we plot the T c slope against the stellar age. The plot and Table 1 clearly show that the correlation with age is quite significant and confirms the result obtained for the surface gravity: old stars are more depleted in refractory elements (lower refractoryto-volatile ratios) than their youn ...
... Fig. 1 we plot the T c slope against the stellar age. The plot and Table 1 clearly show that the correlation with age is quite significant and confirms the result obtained for the surface gravity: old stars are more depleted in refractory elements (lower refractoryto-volatile ratios) than their youn ...
1. INTRODUCTION - Stanford University
... In a recent paper (Sturrock, Walther, & Wheatland 1997, hereafter SWW1), we have presented evidence that the solar neutrino Ñux, as recorded by the Homestake neutrino experiment (see, for instance, Davis & Cox 1991), varies with a periodicity of 12.88 cycles yr~1, corresponding to a synodic rotation ...
... In a recent paper (Sturrock, Walther, & Wheatland 1997, hereafter SWW1), we have presented evidence that the solar neutrino Ñux, as recorded by the Homestake neutrino experiment (see, for instance, Davis & Cox 1991), varies with a periodicity of 12.88 cycles yr~1, corresponding to a synodic rotation ...
Transient events in the EUV transition region and chromosphere
... transition region network. Their durations are between 80 and 200 s and dimensions 6 000–10 000 km. A wavelet analysis reveals a tendency for semi-periodic behaviour, with excess power at a frequency of about 4 mHz. The variations are much less evident in the internetwork or cell regions, although t ...
... transition region network. Their durations are between 80 and 200 s and dimensions 6 000–10 000 km. A wavelet analysis reveals a tendency for semi-periodic behaviour, with excess power at a frequency of about 4 mHz. The variations are much less evident in the internetwork or cell regions, although t ...
end-of-summer report
... solar dynamo, such as flares and sunspots, is useful when searching for cycles on other stars. Flares can dramatically increase the flux of stars for short times and, in observations with insufficient time coverage, can be confused for the maximum of the stars’ magnetic cycles (if they have one). In ...
... solar dynamo, such as flares and sunspots, is useful when searching for cycles on other stars. Flares can dramatically increase the flux of stars for short times and, in observations with insufficient time coverage, can be confused for the maximum of the stars’ magnetic cycles (if they have one). In ...
Observations and analysis of phase scintillation of spacecraft signal
... over the full range of solar elongation angles from 0◦ to 45◦ , which is consistent with Kolmogorov turbulence. Radio astronomical observations of spacecraft signals within the solar system give a unique opportunity to study the temporal behaviour of the signal’s phase fluctuations caused by its pro ...
... over the full range of solar elongation angles from 0◦ to 45◦ , which is consistent with Kolmogorov turbulence. Radio astronomical observations of spacecraft signals within the solar system give a unique opportunity to study the temporal behaviour of the signal’s phase fluctuations caused by its pro ...
Dynamic Martian magnetosphere: Transient - HAL
... temporal variations from observations made by a single spacecraft. In this context, global simulations allow to set back in situ observations into a global frame. Physical parameters specifying the IMF, the solar wind plasma, and the radiation spectrum in the UV and EUV ranges are kept constant duri ...
... temporal variations from observations made by a single spacecraft. In this context, global simulations allow to set back in situ observations into a global frame. Physical parameters specifying the IMF, the solar wind plasma, and the radiation spectrum in the UV and EUV ranges are kept constant duri ...
Chapter 15--Our Sun - Geological Sciences
... nosity, it would be enough to meet current human energy demands for roughly the next 500,000 years! Of course, only a tiny fraction of the Sun’s total energy output reaches Earth, with the rest dispersing in all directions into space. Most of this energy is radiated in the form of visible light, but ...
... nosity, it would be enough to meet current human energy demands for roughly the next 500,000 years! Of course, only a tiny fraction of the Sun’s total energy output reaches Earth, with the rest dispersing in all directions into space. Most of this energy is radiated in the form of visible light, but ...
Solar observation
Solar observation is the scientific endeavor of studying the Sun and its behavior and relation to the Earth and the remainder of the Solar System. Deliberate solar observation began thousands of years ago. That initial era of direct observation gave way to telescopes in the 1600s followed by satellites in the twentieth century.