Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere
Precipitation of energetic electrons to the atmosphere is both a loss mechanism for radiation belt particles and a means by which the geospace environment influences the Earth's atmosphere; thus it is important to fully understand the extent of this precipitation. A set of polar orbiting satell...
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American Geophysical Union
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ftnerc:oai:nora.nerc.ac.uk:520356 2023-05-15T13:49:35+02:00 Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere Kavanagh, Andrew J. Cobbett, Neil Kirsch, Peter 2018-09 text http://nora.nerc.ac.uk/id/eprint/520356/ https://nora.nerc.ac.uk/id/eprint/520356/1/Kavanagh_et_al-2018-Journal_of_Geophysical_Research__Space_Physics.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JA025890 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/520356/1/Kavanagh_et_al-2018-Journal_of_Geophysical_Research__Space_Physics.pdf Kavanagh, Andrew J. orcid:0000-0001-7360-7039 Cobbett, Neil; Kirsch, Peter orcid:0000-0003-2482-0217 . 2018 Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere. Journal of Geophysical Research: Space Physics, 123 (9). 7999-8020. https://doi.org/10.1029/2018JA025890 <https://doi.org/10.1029/2018JA025890> Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1029/2018JA025890 2023-02-04T19:46:43Z Precipitation of energetic electrons to the atmosphere is both a loss mechanism for radiation belt particles and a means by which the geospace environment influences the Earth's atmosphere; thus it is important to fully understand the extent of this precipitation. A set of polar orbiting satellites have been used to identify periods when energetic charged particles fill the slot region between the inner and outer radiation belts. These suggest that electrons with energies >30 keV penetrate this region, even under levels of modest geomagnetic activity. Those events with sufficient fluxes of particles produce enough ionization to be detected by a ground‐based radar in Antarctica; this precipitation lasts for ~10 days on average. Analysis of these data reveal that the average precipitation penetrates to the stratopause (~55 km altitude). For some (if not all) of these events, the likely cause of the most energetic precipitation is an interaction between (relativistic) electrons and plasmaspheric hiss leading to little, if no, local time variation in precipitation. This does not preclude a longitudinal effect given that all radar measurements are fixed in longitude. During winter months the radar is under the stable southern polar atmospheric vortex. This transports atmospheric species to lower altitudes including the ozone destroying chemicals that are produced by energetic precipitation. Thus the precipitation from the slot region in the southern hemisphere will likely contribute to the destruction of ozone and changes to atmospheric heat balance and chemistry; more work is required to determine the true impact of these events. Article in Journal/Newspaper Antarc* Antarctica Natural Environment Research Council: NERC Open Research Archive The Slot ENVELOPE(155.083,155.083,-82.667,-82.667) Journal of Geophysical Research: Space Physics 123 9 7999 8020 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Precipitation of energetic electrons to the atmosphere is both a loss mechanism for radiation belt particles and a means by which the geospace environment influences the Earth's atmosphere; thus it is important to fully understand the extent of this precipitation. A set of polar orbiting satellites have been used to identify periods when energetic charged particles fill the slot region between the inner and outer radiation belts. These suggest that electrons with energies >30 keV penetrate this region, even under levels of modest geomagnetic activity. Those events with sufficient fluxes of particles produce enough ionization to be detected by a ground‐based radar in Antarctica; this precipitation lasts for ~10 days on average. Analysis of these data reveal that the average precipitation penetrates to the stratopause (~55 km altitude). For some (if not all) of these events, the likely cause of the most energetic precipitation is an interaction between (relativistic) electrons and plasmaspheric hiss leading to little, if no, local time variation in precipitation. This does not preclude a longitudinal effect given that all radar measurements are fixed in longitude. During winter months the radar is under the stable southern polar atmospheric vortex. This transports atmospheric species to lower altitudes including the ozone destroying chemicals that are produced by energetic precipitation. Thus the precipitation from the slot region in the southern hemisphere will likely contribute to the destruction of ozone and changes to atmospheric heat balance and chemistry; more work is required to determine the true impact of these events. |
format |
Article in Journal/Newspaper |
author |
Kavanagh, Andrew J. Cobbett, Neil Kirsch, Peter |
spellingShingle |
Kavanagh, Andrew J. Cobbett, Neil Kirsch, Peter Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
author_facet |
Kavanagh, Andrew J. Cobbett, Neil Kirsch, Peter |
author_sort |
Kavanagh, Andrew J. |
title |
Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
title_short |
Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
title_full |
Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
title_fullStr |
Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
title_full_unstemmed |
Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
title_sort |
radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/520356/ https://nora.nerc.ac.uk/id/eprint/520356/1/Kavanagh_et_al-2018-Journal_of_Geophysical_Research__Space_Physics.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JA025890 |
long_lat |
ENVELOPE(155.083,155.083,-82.667,-82.667) |
geographic |
The Slot |
geographic_facet |
The Slot |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/520356/1/Kavanagh_et_al-2018-Journal_of_Geophysical_Research__Space_Physics.pdf Kavanagh, Andrew J. orcid:0000-0001-7360-7039 Cobbett, Neil; Kirsch, Peter orcid:0000-0003-2482-0217 . 2018 Radiation belt slot-region filling events: sustained energetic precipitation into the mesosphere. Journal of Geophysical Research: Space Physics, 123 (9). 7999-8020. https://doi.org/10.1029/2018JA025890 <https://doi.org/10.1029/2018JA025890> |
op_doi |
https://doi.org/10.1029/2018JA025890 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
123 |
container_issue |
9 |
container_start_page |
7999 |
op_container_end_page |
8020 |
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1766251787365384192 |