Solar energetic particle variations
نویسندگان
چکیده
منابع مشابه
Are variations in PMSE intensity affected by energetic particle precipitation?
The correlation between variations in Polar Mesosphere Summer Echoes (PMSE) and variations in energetic particle precipitation is examined. PMSE were observed by the Esrange VHF MST Radar (ESRAD) at 6753 N, 2106 E. The 30 MHz riometer in Abisko (6824 N, 1854 E) registered radio wave absorption caused by ionization changes in response to energetic particle precipitation. The relationship between...
متن کاملMoments of energetic particle distributions in the solar atmosphere
This paper describes a theory that provides a direct link between observable properties of energetic particle distributions and the unobservable properties of the initial distributions. A general approach is first outlined and then applied to the specific situation of collisional electron transport in the solar atmosphere. By building on previous results, this treatment does not require explici...
متن کاملOnset Study of Impulsive Solar Energetic Particle Events
Impulsive solar energetic particle (SEP) events are associated with impulsive X-ray flares, energetic electrons, and enhanced heavy ion abundances. Using instruments on ACE, we have examined the composition and origin of twelve impulsive SEP events from November 1997 to June 2000. have enhanced ‘HerHe ratios compared with the solar wind values. All selected impulsive SEP events The range of ‘He...
متن کاملInitial Time Dependence of Abundances in Solar Energetic Particle Events.
We compare the initial behavior of Fe/O and He/H abundance ratios and their relationship to the evolution of the proton energy spectra in "small" and "large" gradual solar energetic particle (SEP) events. The results are qualitatively consistent with the behavior predicted by the theory of Ng et al. published in 1999. He/H ratios that initially rise with time are a signature of scattering by no...
متن کاملNumerical Studies of the Solar Energetic Particle Transport and Acceleration
Solar energetic particles often get accelerated to energies up to few GeV at interplanetary shock waves driven by Coronal Mass Ejections (CMEs) and are of considerable importance for space weather studies because they can produce radiation hazards for manned or unmanned spacecraft. Particles accelerated at the shock wave can escape upstream and downstream into the interplanetary medium. As the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Advances in Space Research
سال: 2004
ISSN: 0273-1177
DOI: 10.1016/j.asr.2003.02.046