Variability of Energetic 3He in the Inner Heliosphere

Details Variability of Energetic 3He in the Inner Heliosphere Variability of Energetic 3He in the Inner Heliosphere

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62b04w&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH62B-04

Physics

2118 Energetic Particles, Solar, 7514 Energetic Particles (2114), 7519 Flares, 7536 Solar Activity Cycle (2162)

Scientific paper

The large and highly variable enhancement of the 3He/4He abundance ratio over the solar wind value ( ~ 4*E-4) in impulsive solar energetic particle (SEP) events is a well established but, as yet, poorly understood phenomenon. Recent measurements from the ULEIS and SIS instruments on the Advanced Composition Explorer (ACE) spacecraft have shown that: 1) the 3He/4He ratio can be significantly enhanced even in large, gradual SEP events; 2) significant fluxes of 3He are often present in interplanetary space, even during periods of low solar activity; and 3) SEP emission with significantly enhanced 3He/4He can often have long durations (up to a few days) more commonly associated with gradual events. To better understand the origin of energetic 3He in the inner heliosphere, we have investigated the energy spectra of this isotope under a variety of conditions including quiet times, short and long duration 3He-rich events, and large, gradual events. We compare these spectra and discuss their contributions to the longer-term fluences of 3He, and also their variation during the rise from minimum to maximum of the present solar cycle. This work was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC.

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