Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx
During the northern hemisphere winter of 2003–2004 significant levels of stratospheric odd nitrogen (NOX) were observed descending from the mesosphere. Here we study subionospheric radio wave propagation data from Ny Ålesund, Svalbard, Norway to determine the origin of the mesospheric NOX. A clear c...
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American Geophysical Union
2006
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ftnerc:oai:nora.nerc.ac.uk:923 2023-05-15T17:48:27+02:00 Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx Clilverd, Mark A. Seppala, Annika Rodger, Craig J. Verronen, Pekka T. Thomson, Neil R. 2006-10 http://nora.nerc.ac.uk/id/eprint/923/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006GL026727 https://doi.org/10.1029/2006GL026727 unknown American Geophysical Union Clilverd, Mark A. orcid:0000-0002-7388-1529 Seppala, Annika; Rodger, Craig J.; Verronen, Pekka T.; Thomson, Neil R. 2006 Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx. Geophysical Research Letters, 33 (19), L19811. 5, pp. https://doi.org/10.1029/2006GL026727 <https://doi.org/10.1029/2006GL026727> Atmospheric Sciences Space Sciences Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.1029/2006GL026727 2023-02-04T19:20:34Z During the northern hemisphere winter of 2003–2004 significant levels of stratospheric odd nitrogen (NOX) were observed descending from the mesosphere. Here we study subionospheric radio wave propagation data from Ny Ålesund, Svalbard, Norway to determine the origin of the mesospheric NOX. A clear change in the radio wave diurnal variation is observed, starting on January 13, 2004, lasting for 37 days. The behavior is consistent with the ionization, by Lyman-α, of thermospheric NOX descending into the mesosphere from altitudes above 90 km. Estimates of the concentration of NOX required to produce the observed ionization changes are consistent with the levels of previously published stratospheric mixing ratios after the NOX has descended into the stratosphere. The radio wave data shows that no significant proton or electron precipitation events into the mesosphere occurred at this time, and the mesospheric effects of the large storms in October/November 2003 had abated by late December 2003. Article in Journal/Newspaper Ny Ålesund Ny-Ålesund Svalbard Natural Environment Research Council: NERC Open Research Archive Norway Ny-Ålesund Svalbard Geophysical Research Letters 33 19 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Atmospheric Sciences Space Sciences |
spellingShingle |
Atmospheric Sciences Space Sciences Clilverd, Mark A. Seppala, Annika Rodger, Craig J. Verronen, Pekka T. Thomson, Neil R. Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx |
topic_facet |
Atmospheric Sciences Space Sciences |
description |
During the northern hemisphere winter of 2003–2004 significant levels of stratospheric odd nitrogen (NOX) were observed descending from the mesosphere. Here we study subionospheric radio wave propagation data from Ny Ålesund, Svalbard, Norway to determine the origin of the mesospheric NOX. A clear change in the radio wave diurnal variation is observed, starting on January 13, 2004, lasting for 37 days. The behavior is consistent with the ionization, by Lyman-α, of thermospheric NOX descending into the mesosphere from altitudes above 90 km. Estimates of the concentration of NOX required to produce the observed ionization changes are consistent with the levels of previously published stratospheric mixing ratios after the NOX has descended into the stratosphere. The radio wave data shows that no significant proton or electron precipitation events into the mesosphere occurred at this time, and the mesospheric effects of the large storms in October/November 2003 had abated by late December 2003. |
format |
Article in Journal/Newspaper |
author |
Clilverd, Mark A. Seppala, Annika Rodger, Craig J. Verronen, Pekka T. Thomson, Neil R. |
author_facet |
Clilverd, Mark A. Seppala, Annika Rodger, Craig J. Verronen, Pekka T. Thomson, Neil R. |
author_sort |
Clilverd, Mark A. |
title |
Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx |
title_short |
Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx |
title_full |
Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx |
title_fullStr |
Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx |
title_full_unstemmed |
Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx |
title_sort |
ionospheric evidence of thermosphere-to-stratosphere descent of polar nox |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/923/ https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006GL026727 https://doi.org/10.1029/2006GL026727 |
geographic |
Norway Ny-Ålesund Svalbard |
geographic_facet |
Norway Ny-Ålesund Svalbard |
genre |
Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund Svalbard |
op_relation |
Clilverd, Mark A. orcid:0000-0002-7388-1529 Seppala, Annika; Rodger, Craig J.; Verronen, Pekka T.; Thomson, Neil R. 2006 Ionospheric evidence of thermosphere-to-stratosphere descent of polar NOx. Geophysical Research Letters, 33 (19), L19811. 5, pp. https://doi.org/10.1029/2006GL026727 <https://doi.org/10.1029/2006GL026727> |
op_doi |
https://doi.org/10.1029/2006GL026727 |
container_title |
Geophysical Research Letters |
container_volume |
33 |
container_issue |
19 |
_version_ |
1766154533377933312 |