科技报告详细信息
Flat Proton Spectra in Large Solar Energetic Particle Events
Lario, D ; Berger, L ; Wilson, L B, III ; Decker, R B ; Haggerty, D K ; Reolof, E C ; Wimmer-Schweingruber, R F ; Giacalone, J
关键词: ACCELERATION (PHYSICS);    ENERGETIC PARTICLES;    ENERGY SPECTRA;    INTERPLANETARY SHOCK WAVES;    PROTON ENERGY;    SOLAR CORPUSCULAR RADIATION;    SOLAR FLARES;    SOLAR STORMS;    SPECTRUM ANALYSIS;    SUN;    WAVE AMPLIFICATION;    SOLAR WIND;    WIND DIRECTION;   
RP-ID  :  GSFC-E-DAA-TN65592
学科分类:天文学(综合)
美国|英语
来源: NASA Technical Reports Server
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【 摘 要 】

We present solar energetic particle events observed at 1 AU from the Sun for which the proton energy spectra at energies between ~50 keV to ~1 MeV flatten during a period of at least ~12 hours prior to the passage of the associated interplanetary shock. The flattening of the proton energy spectra occurs when the source of the particles (presumably the traveling interplanetary shock) is still downwind from the spacecraft and particle intensities are still continuously increasing. The arrival of the shock at the spacecraft is then characterized by a steepening of the spectra, where low-energy proton intensities show a more pronounced enhancement than the high-energy proton intensities. We discuss the mechanisms that may result in this flattening of the spectra in terms of current models presented in the literature.

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