A Statistical Study of Solar Energetic Electron Events over one Solar Cycle

Details A Statistical Study of Solar Energetic Electron Events over one Solar Cycle A Statistical Study of Solar Energetic Electron Events over one Solar Cycle

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2903w&link_type=abstract

American Astronomical Society, SPD meeting #37, #29.03; Bulletin of the American Astronomical Society, Vol. 38, p.256

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Impulsive solar electron events are the most common impulsive solar particle acceleration phenomenon, often observed at 1-100 keV. Most of these events are associated with small SXR bursts and type III radio bursts, while unaccompanied by HXR bursts. We survey the WIND/3DP electron data ( 1-400 keV) from 1995 through 2005 and identify 1100 solar energetic electron events over one solar cycle. The number of electron events shows a time variation similar to sunspots and SXR flares. Taking into account the effect of instrumental background, we find a quite power-law relationship between the event number N and the event peak flux J: dN/dJ=A×J^(-γ). The integration over the electron flux estimates that >= 10^4 events/year occur the whole Sun near solar maximum. Meanwhile, we survey ion data ( 0.02-10 MeV/nuc) observed by the ACE/ULEIS from 1998 to 2005. We find a good correlation: 80 % of impulsive electron events are accompanied by MeV/nuc, 3He-rich (3He/4He >= 1%) ion emissions; >93% of 3He-rich ion events with a clear velocity dispersion appear to have an impulsive electron event. Finally, We present the correlation between the peak flux of impulsive electrons and the count of 3He and 4He ions.

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