Relationship of Ground Level Enhancement with Solar Flare, Coronal Mass Ejection and Solar Energetic Particle

Details Relationship of Ground Level Enhancement with Solar Flare, Coronal Mass Ejection and Solar Energetic Particle Relationship of Ground Level Enhancement with Solar Flare, Coronal Mass Ejection and Solar Energetic Particle

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh33a1485f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH33A-1485

Astronomy and Astrophysics

Astrophysics

[2104] Interplanetary Physics / Cosmic Rays, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7519] Solar Physics, Astrophysics, And Astronomy / Flares

Scientific paper

Ground level enhancement (GLE) is the sudden increase in the cosmic ray intensity (CRI) which is thought to be caused by solar eruption. In this study we have analyzed the CRI data from 1968 through 2008 registered by several Neutron Monitors and deduced increase rate (%) of GLE events using the 5-minute data mainly from Oulu Neutron Monitor (ONM) and Calgary Neutron Monitor (CNM). To investigate the relations of GLEs with solar X-ray flares, coronal mass ejections (CMEs) and solar energetic particles (SEPs), we have inspected the peak time and peak intensity differences of GLE events. As results, we have found that the peak time (UT) differences vary mostly within ±20 minutes when the peak intensities vary mostly within ±50% at CNM and ONM. It has been observed that GLE events are associated with strong flares as well as fast /halo CMEs. Almost 62% of the flares associated with strong GLE were originated from south-west active region while 38% of the flares were originated from north-west active region. On an exception, an apparently weaker flare associated with GLE is not actually a weaker flare, rather a large flare existing behind the limb. The average of GLE associated CMEs is (1916.60 km/s) much faster than the average (458.53 km/s) of all CMEs. The fluences of the high energy proton flux (PF > 100MeV) associated with the GLE are stronger than those associated with non-GLE events. We will introduce our results briefly and discuss on the relationship of GLE with flare, CME and SEP.

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