Origin of energetic electron precipitation >30 keV into the atmosphere
Energetic electrons are deposited into the atmosphere from Earth's inner magnetosphere, resulting in the production of odd nitrogen (NOx). During polar night, NOx can be transported to low altitudes, where it can destroy ozone, affecting the atmospheric radiation balance. Since the flux of ener...
Published in: | Journal of Geophysical Research: Space Physics |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2010
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/13721/ https://nora.nerc.ac.uk/id/eprint/13721/1/jgra20164.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JA014619 |
id |
ftnerc:oai:nora.nerc.ac.uk:13721 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:13721 2023-05-15T18:02:17+02:00 Origin of energetic electron precipitation >30 keV into the atmosphere Lam, Mai Mai Horne, Richard B. Meredith, Nigel P. Glauert, Sarah A. Moffat-Griffin, Tracy Green, Janet C. 2010-04 text http://nora.nerc.ac.uk/id/eprint/13721/ https://nora.nerc.ac.uk/id/eprint/13721/1/jgra20164.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JA014619 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/13721/1/jgra20164.pdf Lam, Mai Mai; Horne, Richard B. orcid:0000-0002-0412-6407 Meredith, Nigel P. orcid:0000-0001-5032-3463 Glauert, Sarah A. orcid:0000-0003-0149-8608 Moffat-Griffin, Tracy orcid:0000-0002-9670-6715 Green, Janet C. 2010 Origin of energetic electron precipitation >30 keV into the atmosphere. Journal of Geophysical Research, 115 (A4), A00F08. 15, pp. https://doi.org/10.1029/2009JA014619 <https://doi.org/10.1029/2009JA014619> Atmospheric Sciences Chemistry Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1029/2009JA014619 2023-02-04T19:28:47Z Energetic electrons are deposited into the atmosphere from Earth's inner magnetosphere, resulting in the production of odd nitrogen (NOx). During polar night, NOx can be transported to low altitudes, where it can destroy ozone, affecting the atmospheric radiation balance. Since the flux of energetic electrons trapped in the magnetosphere is related to solar activity, the precipitation of these electrons into Earth's atmosphere provides a link between solar variability and changes in atmospheric chemistry which may affect Earth's climate. To determine the global distribution of the precipitating flux, we have built a statistical model binned by auroral electrojet (AE) index, magnetic local time (MLT), and L shell of E > 30 keV precipitating electrons from the Medium Energy Proton and Electron Detector (MEPED) on board the NOAA Polar Orbiting Environmental Satellites (POES) low-altitude satellites NOAA-15, NOAA-16, NOAA-17, and NOAA-18. We show that the precipitating flux increases with geomagnetic activity, suggesting that the flux is related to substorm activity. The precipitating fluxes maximize during active conditions where they are primarily seen outside of the plasmapause on the dawnside. The global distribution of the precipitating flux of E > 30 keV electrons is well-correlated with the global distribution of lower-band chorus waves as observed by the plasma wave experiment onboard the Combined Release and Radiation Effects Satellite (CRRES) satellite. In addition, the electron precipitation occurs where the pitch angle diffusion coefficient due to resonant interaction between electrons and whistler mode chorus waves is high, as calculated using the pitch angle and energy diffusion of ions and electrons (PADIE) code. Our results suggest that lower-band chorus is very important for scattering > 30 keV electrons from Earth's inner magnetosphere into the atmosphere. Article in Journal/Newspaper polar night Natural Environment Research Council: NERC Open Research Archive Journal of Geophysical Research: Space Physics 115 A4 n/a n/a |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Atmospheric Sciences Chemistry |
spellingShingle |
Atmospheric Sciences Chemistry Lam, Mai Mai Horne, Richard B. Meredith, Nigel P. Glauert, Sarah A. Moffat-Griffin, Tracy Green, Janet C. Origin of energetic electron precipitation >30 keV into the atmosphere |
topic_facet |
Atmospheric Sciences Chemistry |
description |
Energetic electrons are deposited into the atmosphere from Earth's inner magnetosphere, resulting in the production of odd nitrogen (NOx). During polar night, NOx can be transported to low altitudes, where it can destroy ozone, affecting the atmospheric radiation balance. Since the flux of energetic electrons trapped in the magnetosphere is related to solar activity, the precipitation of these electrons into Earth's atmosphere provides a link between solar variability and changes in atmospheric chemistry which may affect Earth's climate. To determine the global distribution of the precipitating flux, we have built a statistical model binned by auroral electrojet (AE) index, magnetic local time (MLT), and L shell of E > 30 keV precipitating electrons from the Medium Energy Proton and Electron Detector (MEPED) on board the NOAA Polar Orbiting Environmental Satellites (POES) low-altitude satellites NOAA-15, NOAA-16, NOAA-17, and NOAA-18. We show that the precipitating flux increases with geomagnetic activity, suggesting that the flux is related to substorm activity. The precipitating fluxes maximize during active conditions where they are primarily seen outside of the plasmapause on the dawnside. The global distribution of the precipitating flux of E > 30 keV electrons is well-correlated with the global distribution of lower-band chorus waves as observed by the plasma wave experiment onboard the Combined Release and Radiation Effects Satellite (CRRES) satellite. In addition, the electron precipitation occurs where the pitch angle diffusion coefficient due to resonant interaction between electrons and whistler mode chorus waves is high, as calculated using the pitch angle and energy diffusion of ions and electrons (PADIE) code. Our results suggest that lower-band chorus is very important for scattering > 30 keV electrons from Earth's inner magnetosphere into the atmosphere. |
format |
Article in Journal/Newspaper |
author |
Lam, Mai Mai Horne, Richard B. Meredith, Nigel P. Glauert, Sarah A. Moffat-Griffin, Tracy Green, Janet C. |
author_facet |
Lam, Mai Mai Horne, Richard B. Meredith, Nigel P. Glauert, Sarah A. Moffat-Griffin, Tracy Green, Janet C. |
author_sort |
Lam, Mai Mai |
title |
Origin of energetic electron precipitation >30 keV into the atmosphere |
title_short |
Origin of energetic electron precipitation >30 keV into the atmosphere |
title_full |
Origin of energetic electron precipitation >30 keV into the atmosphere |
title_fullStr |
Origin of energetic electron precipitation >30 keV into the atmosphere |
title_full_unstemmed |
Origin of energetic electron precipitation >30 keV into the atmosphere |
title_sort |
origin of energetic electron precipitation >30 kev into the atmosphere |
publisher |
American Geophysical Union |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/13721/ https://nora.nerc.ac.uk/id/eprint/13721/1/jgra20164.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JA014619 |
genre |
polar night |
genre_facet |
polar night |
op_relation |
https://nora.nerc.ac.uk/id/eprint/13721/1/jgra20164.pdf Lam, Mai Mai; Horne, Richard B. orcid:0000-0002-0412-6407 Meredith, Nigel P. orcid:0000-0001-5032-3463 Glauert, Sarah A. orcid:0000-0003-0149-8608 Moffat-Griffin, Tracy orcid:0000-0002-9670-6715 Green, Janet C. 2010 Origin of energetic electron precipitation >30 keV into the atmosphere. Journal of Geophysical Research, 115 (A4), A00F08. 15, pp. https://doi.org/10.1029/2009JA014619 <https://doi.org/10.1029/2009JA014619> |
op_doi |
https://doi.org/10.1029/2009JA014619 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
115 |
container_issue |
A4 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766172087417831424 |