Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event
We present a study of the 2014 January 6 solar energetic particle event which produced a small ground level enhancement (GLE), making it the second GLE of this unusual solar cycle 24. This event was primarily observed by the South Pole neutron monitors (increase of approximately 2.5 percent) while a...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20150008407 2023-05-15T18:22:05+02:00 Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event Davila, J. M. Gopalswamy, N. Makela, P. Yashiro, S. Akiyama, S. Xie, H. Thakur, N. Unclassified, Unlimited, Publicly available July 9, 2014 application/pdf http://hdl.handle.net/2060/20150008407 unknown Document ID: 20150008407 http://hdl.handle.net/2060/20150008407 Copyright, Distribution as joint owner in the copyright CASI Solar Physics Space Radiation GSFC-E-DAA-TN22767 The Astrophysical Journal Letters; 790; 1; L13 2014 ftnasantrs 2019-07-21T00:10:48Z We present a study of the 2014 January 6 solar energetic particle event which produced a small ground level enhancement (GLE), making it the second GLE of this unusual solar cycle 24. This event was primarily observed by the South Pole neutron monitors (increase of approximately 2.5 percent) while a few other neutron monitors recorded smaller increases. The associated coronal mass ejection (CME) originated behind the western limb and had a speed of 1960 kilometers per second. The height of the CME at the start of the associated metric type II radio burst, which indicates the formation of a strong shock, was measured to be 1.61 solar radii using a direct image from STEREO-A/EUVI. The CME height at the time of the GLE particle release (determined using the South Pole neutron monitor data) was directly measured as 2.96 solar radii based on STEREO-A/COR1 white-light observations. These CME heights are consistent with those obtained for GLE71, the only other GLE of the current cycle, as well as cycle-23 GLEs derived using back-extrapolation. GLE72 is of special interest because it is one of only two GLEs of cycle 24, one of two behind-the-limb GLEs, and one of the two smallest GLEs of cycles 23 and 24. Other/Unknown Material South pole NASA Technical Reports Server (NTRS) South Pole |
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NASA Technical Reports Server (NTRS) |
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Solar Physics Space Radiation |
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Solar Physics Space Radiation Davila, J. M. Gopalswamy, N. Makela, P. Yashiro, S. Akiyama, S. Xie, H. Thakur, N. Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event |
topic_facet |
Solar Physics Space Radiation |
description |
We present a study of the 2014 January 6 solar energetic particle event which produced a small ground level enhancement (GLE), making it the second GLE of this unusual solar cycle 24. This event was primarily observed by the South Pole neutron monitors (increase of approximately 2.5 percent) while a few other neutron monitors recorded smaller increases. The associated coronal mass ejection (CME) originated behind the western limb and had a speed of 1960 kilometers per second. The height of the CME at the start of the associated metric type II radio burst, which indicates the formation of a strong shock, was measured to be 1.61 solar radii using a direct image from STEREO-A/EUVI. The CME height at the time of the GLE particle release (determined using the South Pole neutron monitor data) was directly measured as 2.96 solar radii based on STEREO-A/COR1 white-light observations. These CME heights are consistent with those obtained for GLE71, the only other GLE of the current cycle, as well as cycle-23 GLEs derived using back-extrapolation. GLE72 is of special interest because it is one of only two GLEs of cycle 24, one of two behind-the-limb GLEs, and one of the two smallest GLEs of cycles 23 and 24. |
format |
Other/Unknown Material |
author |
Davila, J. M. Gopalswamy, N. Makela, P. Yashiro, S. Akiyama, S. Xie, H. Thakur, N. |
author_facet |
Davila, J. M. Gopalswamy, N. Makela, P. Yashiro, S. Akiyama, S. Xie, H. Thakur, N. |
author_sort |
Davila, J. M. |
title |
Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event |
title_short |
Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event |
title_full |
Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event |
title_fullStr |
Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event |
title_full_unstemmed |
Ground Level Enhancement in the 2014 January 6 Solar Energetic Particle Event |
title_sort |
ground level enhancement in the 2014 january 6 solar energetic particle event |
publishDate |
2014 |
url |
http://hdl.handle.net/2060/20150008407 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
CASI |
op_relation |
Document ID: 20150008407 http://hdl.handle.net/2060/20150008407 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766201445867061248 |