Shock-induced Trapping of Solar Energetic Particles in the Earth's Magnetosphere

Details Shock-induced Trapping of Solar Energetic Particles in the Earth's Magnetosphere Shock-induced Trapping of Solar Energetic Particles in the Earth's Magnetosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51a0500h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM51A-0500

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2720 Energetic Particles, Trapped, 2753 Numerical Modeling

Scientific paper

The recent SAMPEX report of prompt trapping of solar energetic Fe at L=2 in association with a Storm Sudden Commencement (SSC) during the Bastille Day 2000 event1 has led to examination of other recent Solar Energetic Particle (SEP) trapping events, which include two in November 2001 with trapped Fe signatures. While the the November 6 storm had a larger -Dst value (-277 vs. -213 nT), the second storm was preceeded by a strong SSC impulse (+ 20 nT hourly averaged preliminary Dst), known to be a necessary condition for shock trapping of SEPs2,3. Other necessary conditions for radial transport by a magnetopause compression-induced electric field impulse are examined. Both November SEP trapping events were characterized by an ICME shock speed exceeding 1200 km/s and > 10 MeV GOES proton fluxes exceeding 104. The larger Dst value for the earlier event is likely to affect the minimum cutoff latitude and minimum L-value of the SEP source population4. Coupled MHD-guiding center test particle simulations of the November 24 storm injection are compared with those of the Bastille Day event. Solar wind conditions, the minimum L-value and time scale for trapping in the magnetosphere are examined. The rarity of such events for electrons is also explained. [1]Lorentzen et al., {JGR}, in press, 2002. [2] Li et al., {GRL, 20,} 2423, 1993. [3]Hudson et al., {GRL, 22,} 291, 1995; {JGR, 102}, 14,087, 1997. [4]Leske et al., {JGR, 106, 30,001, 2001}

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