Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh33a1476a&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH33A-1476
Physics
Plasma Physics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves
Scientific paper
We report new evidence on energetic protons penetrating previous shock wave. We have chosen four Multi Eruption Solar Energetic Particle (MESEP) events from the list presented by Al-Sawad 2007, and observed by Energetic and Relativistic Nuclei and Electron (ERNE) instrument on the Solar and Heliospheric Observatory (SOHO). Two events were studied in details, the event of 2001 October 19-21, which was in association with two X1.6/2B solar flares and halo CMEs separated by ~15 hours and the event of 2000 April 04, which was associated with two CMEs separated by ~8 hours. The other two new MESEP events were on 2000 February 17-19 and 2005 August 22-25. The first event was associated with two CMEs. The first halo CME was associated with M 1.3 solar flare at S29E07 Hα location from the NOAA AR 8827, and with metric and later D-H type II radio bursts, indicating a formation of shock wave, which was later passed near the Earth's orbit and registered, by SOHO, ACE and Wind spacecrafts. The second CME erupted from the south-west after ~13 hours. The second event was associated with two halo CMEs separated by ~16 and erupted from same NOAA AR 10798 in association with M class solar flares. The first halo was in association with metric type II but both were in association with D-H type II. In both events the first CME was decelerating and both events can be classified as gradual SEP events. Our analysis for proton flux anisotropy data, He/P ratio and possible velocity dispersion in the second peak of the intensity-time profile are related to the second CME in both events. This suggests that the energetic protons > 10 MeV penetrate the first shock waves associated with first CMEs in order to reach 1 AU and thus, these observations indicate that capability of interplanetary shock to accelerate high-energy protons gradually declines as shock travels from near the Sun to beyond 1~AU.
Al-Sawad Amjad
Kocharov Leon G.
Laitinen T. L.
Saloniemi Oskari
Valtonen Eino
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