Temporal Evolution of Solar Energetic Particle Spectra
نویسندگان
چکیده
منابع مشابه
Time Evolution of Elemental Ratios in Solar Energetic Particle Events
Heavy ion ratio abundances in Solar Energetic Particle (SEP) events, e.g. Fe/O, often exhibit decreases over time. Using particle instruments on the ACE, SOHO and STEREO spacecraft, we analysed heavy ion data from 4 SEP events taking place between December 2006 and December 2014. We constructed 36 different ionic pairs and studied their time evolution in each event. We quantified the temporal b...
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The 1998 Sep 30 and 2000 Apr 4 events are both large western solar energetic particle (SEP) events, in which 1 MeV proton intensities exceed 10 particles (cm s sr MeV) . Yet they exhibit quite different time variations of elemental abundance ratios and energy spectra. Using a model of SEP transport through self-amplified interplanetary Alfvén waves, we fit the simultaneous observations of proto...
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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...
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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...
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ژورنال
عنوان ژورنال: Solar Physics
سال: 2016
ISSN: 0038-0938,1573-093X
DOI: 10.1007/s11207-016-0956-4