Low energy SEP events of October/November 2003 at 1 and 5 AU
Abstract
The late October-early November solar energetic particle (SEP) events during the declining stage of solar cycle 23 provide an outstanding opportunity to investigate the propagation of solar-produced ions and electrons in the inner (<5 AU) heliosphere. The EPAM instrument on the ACE spacecraft (1 AU) and the HISCALE instrument on the Ulysses spacecraft (essentially in the ecliptic plane at 5.2 AU and about 117^o east of the Earth-Sun line) were ideally situated to measure the in-ecliptic interplanetary particles produced by the series of large solar events. Of particular interest is the particle event on 28 October 2003 (day 301) following the exceptionally large X17 flare in Active Region 486. Particles were observed at both ACE and Ulysses; quite rapid onsets of the intensities of ions were measured at both spacecraft. Indeed, this event may have the most rapid onset of any SEP event ever measured at 5 AU. This presentation will concentrate on an examination of the intensities, time dependence, and radial gradients of protons and heavy ions (Z ≥ 2) that were measured during the series of SEPs in this time interval.
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35..669L