Populating the Inner Heliosphere (<5 AU) With Heavy Ions

Details Populating the Inner Heliosphere (<5 AU) With Heavy Ions Populating the Inner Heliosphere (<5 AU) With Heavy Ions

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31a05m&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31A-05

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2139 Interplanetary Shocks, 7514 Energetic Particles (2114)

Scientific paper

Heavy ion (Z > 2) measurements were made on the ACE (1 AU) and Ulysses (3.2 AU) spacecraft in the inner heliosphere during the July 14, 2000 solar events. Following the last interplanetary shock event at ~ 1437 UT on July 15, the heavy ion fluxes at 1 AU began to decay with an e-folding decay time for both O and Fe ions (0.5--1 MeV/nucl) of ~ 1 day. This e-folding decay continued for ~ 5 days, to July 21. In contrast, the heavy ion fluxes at Ulysses (heliolatitude ~ 62oS; ~ 90o in longitude from the ACE-Sun line) abruptly increased in intensity on July 14, and continued to increase slowly thereafter. The approximate e-folding time of ~ 6 days for the Ulysses increase persisted for ~ 7 days. The ion fluxes at both locations became approximately equal on July 21, indicating that the inner heliosphere (to ~ 3.2 AU) contained an approximately uniform reservoir of heavy ions in a volume of ~ 102 {AU}3 ( ~ 3.4 ṡ 1024 {km}3). The equality of the decaying fluxes at the two locations persisted for more than two weeks, at times modulated more noticeably at 1 AU by solar activity. The observations will be described and discussed in the context of the filling of a reservoir of ions in the inner heliosphere by solar activity and the subsequent slow decrease in particles as the solar-initiated shock wave disturbances propagate outward to the distant heliosphere. The several time constants measured contain information on the acceleration of particles by the propagating shocks and the leakage of particles through the outward-propagating shock barriers.

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