Diurnal modulation of the quiet time penetrating electron flux
Three sounding rocket measurements of energetic electron precipitation in the 65 to 80 km altitude range above Siple Station, Antarctica suggest a possible diurnal modulation of the precipitation. Flights made on January 10 and 11, 1981, to investigate this possibility showed that no electrons were...
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1985
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ftnasantrs:oai:casi.ntrs.nasa.gov:19850037011 2023-05-15T13:40:59+02:00 Diurnal modulation of the quiet time penetrating electron flux Sheldon, W. R. Benbrook, J. R. Gelpi, C. G. Unclassified, Unlimited, Publicly available Jan 1, 1985 http://ntrs.nasa.gov/search.jsp?R=19850037011 unknown http://ntrs.nasa.gov/search.jsp?R=19850037011 Accession ID: 85A19162 Copyright Other Sources 46 Journal of Geophysical Research; 90; 548-552 1985 ftnasantrs 2012-02-15T16:17:33Z Three sounding rocket measurements of energetic electron precipitation in the 65 to 80 km altitude range above Siple Station, Antarctica suggest a possible diurnal modulation of the precipitation. Flights made on January 10 and 11, 1981, to investigate this possibility showed that no electrons were present after local noon, while a significant flux of penetrating electrons was observed the following day near local dawn, even though the level of magnetic activity was higher during the postnoon flight. A prevous flight from Siple Station also observed a large flux of penetrating electrons near local dawn. Calculations of electron drift trajectories in a model magnetic field indicate that moderate values of the convection electric field could cause significant local time variations in the penetrating electron flux at the western edge of the South Atlantic anomaly. These calculations indicate that Siple Station is shadowed by eastern Siberia when it is at local noon, but not when it is at local dawn. Other/Unknown Material Antarc* Antarctica Siberia NASA Technical Reports Server (NTRS) Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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46 |
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46 Sheldon, W. R. Benbrook, J. R. Gelpi, C. G. Diurnal modulation of the quiet time penetrating electron flux |
topic_facet |
46 |
description |
Three sounding rocket measurements of energetic electron precipitation in the 65 to 80 km altitude range above Siple Station, Antarctica suggest a possible diurnal modulation of the precipitation. Flights made on January 10 and 11, 1981, to investigate this possibility showed that no electrons were present after local noon, while a significant flux of penetrating electrons was observed the following day near local dawn, even though the level of magnetic activity was higher during the postnoon flight. A prevous flight from Siple Station also observed a large flux of penetrating electrons near local dawn. Calculations of electron drift trajectories in a model magnetic field indicate that moderate values of the convection electric field could cause significant local time variations in the penetrating electron flux at the western edge of the South Atlantic anomaly. These calculations indicate that Siple Station is shadowed by eastern Siberia when it is at local noon, but not when it is at local dawn. |
format |
Other/Unknown Material |
author |
Sheldon, W. R. Benbrook, J. R. Gelpi, C. G. |
author_facet |
Sheldon, W. R. Benbrook, J. R. Gelpi, C. G. |
author_sort |
Sheldon, W. R. |
title |
Diurnal modulation of the quiet time penetrating electron flux |
title_short |
Diurnal modulation of the quiet time penetrating electron flux |
title_full |
Diurnal modulation of the quiet time penetrating electron flux |
title_fullStr |
Diurnal modulation of the quiet time penetrating electron flux |
title_full_unstemmed |
Diurnal modulation of the quiet time penetrating electron flux |
title_sort |
diurnal modulation of the quiet time penetrating electron flux |
publishDate |
1985 |
url |
http://ntrs.nasa.gov/search.jsp?R=19850037011 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
geographic |
Siple |
geographic_facet |
Siple |
genre |
Antarc* Antarctica Siberia |
genre_facet |
Antarc* Antarctica Siberia |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19850037011 Accession ID: 85A19162 |
op_rights |
Copyright |
_version_ |
1766144173876969472 |