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- W1982605184 abstract "view Abstract Citations (13) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hydrogen over helium enhancement in successive solar flare particle events from the same active region. Briggs, P. R. ; Armstrong, T. P. ; Krimigis, S. M. Abstract An analysis of all of the identified solar-flare-associated energetic particle events in the 1972-1975 period observed with instruments aboard the IMP 7 and IMP 8 satellites has revealed at least eight occasions when more than one particle-producing flare occurred within the same McMath active plage region during its transit of the visible solar disk. A strong tendency for second flares to produce hydrogen over helium (p/alpha) enhanced energetic particle fluxes when compared with the first flare in the 1.8-10.0 MeV per nucleon range emerged in these multiflare regions. The p/alpha enhancement is apparently transient, and for flares separated by at least about 100 hours the p/alpha ratio tends toward its preflare value. It is suggested that the substrate plasma in an active region may be enriched prior to a flare in elements heavier than hydrogen and the composition may not be significantly altered during subsequent acceleration, escape, and propagation. Thus, the preflare history of the active region must be added to the list of factors influencing observed solar-particle-event composition. Publication: The Astrophysical Journal Pub Date: March 1979 DOI: 10.1086/182909 Bibcode: 1979ApJ...228L..83B Keywords: Alpha Particles; Satellite Observation; Solar Activity Effects; Solar Corpuscular Radiation; Solar Flares; Solar Protons; Helium; Hydrogen; Mass Ratios; Plasma Composition; Solar Wind; Solar Physics; Hydrogen:Solar Flares; Solar Flares:Element Abundances; Solar Flares:Particles; Solar Flares:Solar Wind full text sources ADS | Related Materials (1) Erratum: 1979ApJ...232L..77B" @default.
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- W1982605184 date "1979-03-01" @default.
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- W1982605184 title "Hydrogen over helium enhancement in successive solar flare particle events from the same active region" @default.
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