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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
IJRSP Vol.39(5) [October 2010] >
| Title: | Ground level enhancement events of Solar cycle 23 |
| Authors: | Gopalswamy, N
Xie, H
Yashiro, S
Usoskin, I |
| Keywords: | Ground level enhancement (GLE) event
Coronal mass ejection (CME)
Solar flare
Shock
Solar energetic particle (SEP) event
Radio burst |
| Issue Date: | Oct-2010 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 96.60.ph; 96.60.qe; 96.60.Vg; 96.50.Fm |
| Abstract: | Ground level enhancement (GLE) events, typically
in the GeV energy range, are the most energetic of solar energetic particle
(SEP) events with the protons penetrating Earth’s neutral atmosphere. During
solar cycle 23, sixteen GLE events were observed with excellent data coverage
of associated solar eruptions. The source of these GLE particles has been
examined in this paper using white light observations of coronal mass
ejections, type II radio bursts, and soft X-ray flares. It has been shown that
the GLE events are consistent with shock acceleration in every single case.
While the possibility of the presence of a flare component during GLE events
cannot be ruled out, it can be definitely said that a shock component is
present in all the GLE events. During 18 April 2001 GLE event, the source was
located ~30 degrees behind the west limb, which is too far away from the
magnetic field lines connecting Earth and hence the flare component can be
ruled out. Also the presence of interplanetary shocks associated with the GLEs
is shown using radio and in-situ
observations. |
| Page(s): | 240-248 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.39(5) [October 2010]
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