The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing
We focus on total mass density enhancements in the vicinity of the polar cusp which have been frequently sampled by the CHAMP satellite in about 400 km altitude. In a statistical analysis these cusp-related density anomalies are found to be a continuous phenomenon in the dayside auroral regions of b...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_242309 2023-05-15T16:04:43+02:00 The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing Rentz, S. Lühr, H. 2009 https://gfzpublic.gfz-potsdam.de/pubman/item/item_242309 unknown https://gfzpublic.gfz-potsdam.de/pubman/item/item_242309 DPG-Verhandlungen (Greifswald 2009) 550 - Earth sciences info:eu-repo/semantics/conferenceObject 2009 ftgfzpotsdam 2022-09-14T05:54:29Z We focus on total mass density enhancements in the vicinity of the polar cusp which have been frequently sampled by the CHAMP satellite in about 400 km altitude. In a statistical analysis these cusp-related density anomalies are found to be a continuous phenomenon in the dayside auroral regions of both hemispheres which is partly driven by the strength of the solar activity (P10.7), but more directly by the energy input of the solar wind (merging electric field). The atmospheric fountain effect in the polar cusp region causes the locally confined density anomaly. Its generation mechanisms are investigated in a combined CHAMP-EISCAT campaign, a model studies on soft particle precipitation, and a harmonic analysis of the density anomaly and of potential controlling parameters. The mechanism is suggested for the density anomaly: There is an energy input by the solar wind, which provides the power for the Joule heating of preferably neutral molecules. Simultaneous soft particle precipitation in the cusp increases the height of maximal Pedersen conductivity, thus lifting up the heated layer in the cusp. The density anomaly is then partly caused by a local composition change as a result of the enhanced heavier particle scale height. Conference Object EISCAT GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Pedersen ENVELOPE(140.013,140.013,-66.668,-66.668) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Rentz, S. Lühr, H. The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing |
topic_facet |
550 - Earth sciences |
description |
We focus on total mass density enhancements in the vicinity of the polar cusp which have been frequently sampled by the CHAMP satellite in about 400 km altitude. In a statistical analysis these cusp-related density anomalies are found to be a continuous phenomenon in the dayside auroral regions of both hemispheres which is partly driven by the strength of the solar activity (P10.7), but more directly by the energy input of the solar wind (merging electric field). The atmospheric fountain effect in the polar cusp region causes the locally confined density anomaly. Its generation mechanisms are investigated in a combined CHAMP-EISCAT campaign, a model studies on soft particle precipitation, and a harmonic analysis of the density anomaly and of potential controlling parameters. The mechanism is suggested for the density anomaly: There is an energy input by the solar wind, which provides the power for the Joule heating of preferably neutral molecules. Simultaneous soft particle precipitation in the cusp increases the height of maximal Pedersen conductivity, thus lifting up the heated layer in the cusp. The density anomaly is then partly caused by a local composition change as a result of the enhanced heavier particle scale height. |
format |
Conference Object |
author |
Rentz, S. Lühr, H. |
author_facet |
Rentz, S. Lühr, H. |
author_sort |
Rentz, S. |
title |
The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing |
title_short |
The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing |
title_full |
The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing |
title_fullStr |
The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing |
title_full_unstemmed |
The atmospheric fountain in the cusp region: A response to solar and magnetospheric forcing |
title_sort |
atmospheric fountain in the cusp region: a response to solar and magnetospheric forcing |
publishDate |
2009 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_242309 |
long_lat |
ENVELOPE(140.013,140.013,-66.668,-66.668) |
geographic |
Pedersen |
geographic_facet |
Pedersen |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
DPG-Verhandlungen (Greifswald 2009) |
op_relation |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_242309 |
_version_ |
1766400346574290944 |