Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations
The FTS instrument on SciSat-I observed a very large NO(x) anomaly in mid February of 2004 near 80 N in the lower mesosphere. It has been proposed that the most likely origin of the lower mesosphere anomaly in February is transport, from the lower thermosphere or upper mesosphere, of high levels of...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20050210136 2023-05-15T18:02:16+02:00 Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations Semeniuk, K. McConnell, J. C. Jackman, C. H. Unclassified, Unlimited, Publicly available [2005] application/pdf http://hdl.handle.net/2060/20050210136 unknown Document ID: 20050210136 http://hdl.handle.net/2060/20050210136 Copyright, Distribution as joint owner in the copyright CASI Space Sciences (General) 2005 ftnasantrs 2018-06-09T23:01:00Z The FTS instrument on SciSat-I observed a very large NO(x) anomaly in mid February of 2004 near 80 N in the lower mesosphere. It has been proposed that the most likely origin of the lower mesosphere anomaly in February is transport, from the lower thermosphere or upper mesosphere, of high levels of NO(x) associated with high levels of solar activity in 0ct.-Nov. 2003. There was no major solar flare activity during January and February to cause ionization in the mesosphere. Using a middle atmosphere GCM we investigate whether the NO(x) produced directly by the 0ct.-Nov. 2003 solar flares or indirectly via enhanced auroral ionization as a result of magnetospheric precipitation can explain the ACE observations. We find that the solar proton events associated with the solar explosions in 0ct.-Nov. 2003 produce insufficient amounts of NO(x), in the mesosphere and thermosphere (less than 2 ppm at 90 km) to give rise to the observed anomaly. However. there is evidence that intense aurorae caused by the 0ct.-Nov. 2003 solar storms produced thermospheric values of NO(x) reaching hundreds of ppm. The NO(x) created by the auroral particles appears to have lasted much longer than the immediate period of the 0ct.-Nov. 2003 solar storms. It appears that NO(x) rich air experienced confined polar night descent into the middle mesosphere during November and December, prior to the onset of the strong mesospheric vortex in January 2004. Other/Unknown Material polar night NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
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topic |
Space Sciences (General) |
spellingShingle |
Space Sciences (General) Semeniuk, K. McConnell, J. C. Jackman, C. H. Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations |
topic_facet |
Space Sciences (General) |
description |
The FTS instrument on SciSat-I observed a very large NO(x) anomaly in mid February of 2004 near 80 N in the lower mesosphere. It has been proposed that the most likely origin of the lower mesosphere anomaly in February is transport, from the lower thermosphere or upper mesosphere, of high levels of NO(x) associated with high levels of solar activity in 0ct.-Nov. 2003. There was no major solar flare activity during January and February to cause ionization in the mesosphere. Using a middle atmosphere GCM we investigate whether the NO(x) produced directly by the 0ct.-Nov. 2003 solar flares or indirectly via enhanced auroral ionization as a result of magnetospheric precipitation can explain the ACE observations. We find that the solar proton events associated with the solar explosions in 0ct.-Nov. 2003 produce insufficient amounts of NO(x), in the mesosphere and thermosphere (less than 2 ppm at 90 km) to give rise to the observed anomaly. However. there is evidence that intense aurorae caused by the 0ct.-Nov. 2003 solar storms produced thermospheric values of NO(x) reaching hundreds of ppm. The NO(x) created by the auroral particles appears to have lasted much longer than the immediate period of the 0ct.-Nov. 2003 solar storms. It appears that NO(x) rich air experienced confined polar night descent into the middle mesosphere during November and December, prior to the onset of the strong mesospheric vortex in January 2004. |
author |
Semeniuk, K. McConnell, J. C. Jackman, C. H. |
author_facet |
Semeniuk, K. McConnell, J. C. Jackman, C. H. |
author_sort |
Semeniuk, K. |
title |
Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations |
title_short |
Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations |
title_full |
Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations |
title_fullStr |
Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations |
title_full_unstemmed |
Simulation of the October-November 2003 solar proton event in the CMAM GCM: Comparison with observations |
title_sort |
simulation of the october-november 2003 solar proton event in the cmam gcm: comparison with observations |
publishDate |
2005 |
url |
http://hdl.handle.net/2060/20050210136 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
polar night |
genre_facet |
polar night |
op_source |
CASI |
op_relation |
Document ID: 20050210136 http://hdl.handle.net/2060/20050210136 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
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1766172075957944320 |