High-latitude ground-based observations of the thermospheric ion-drag time constant
From previous studies, it has been conclusively demonstrated that F-region thermospheric winds follow, but generally lag behind, the ion drift pattern of magnetospheric convection. Analysis of the ion-neutral momentum exchange equation shows that ion-drag and thermal pressure are the major contribut...
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ftulancaster:oai:eprints.lancs.ac.uk:6596 2023-08-27T04:09:14+02:00 High-latitude ground-based observations of the thermospheric ion-drag time constant Kosch, M. J. Cierpka, K. Rietveld, M. T. Hagfors, T. Schlegel, K. 2001-04 https://eprints.lancs.ac.uk/id/eprint/6596/ https://doi.org/10.1029/2000GL012380 unknown Kosch, M. J. and Cierpka, K. and Rietveld, M. T. and Hagfors, T. and Schlegel, K. (2001) High-latitude ground-based observations of the thermospheric ion-drag time constant. Geophysical Research Letters, 28 (7). pp. 1395-1398. ISSN 0094-8276 Journal Article PeerReviewed 2001 ftulancaster https://doi.org/10.1029/2000GL012380 2023-08-03T22:16:10Z From previous studies, it has been conclusively demonstrated that F-region thermospheric winds follow, but generally lag behind, the ion drift pattern of magnetospheric convection. Analysis of the ion-neutral momentum exchange equation shows that ion-drag and thermal pressure are the major contributors to neutral momentum forcing at F-region heights with relatively minor effects from coriolis, advection and viscous forces. An ion-neutral coupling time constant (e-folding time) has been defined which describes the time taken for the neutral gas velocity to approach the ion velocity after a step change in convection. In this study, F-region ion drift and neutral winds have been observed by the EISCAT tristatic incoherent scatter facility and a ground-based Fabry-Perot interferometer, respectively, from northern Scandinavia. The e-folding time varies in the range 0.5 - 6.5 hours, with an average of 1.8 and 3.3 hours for a geomagnetically active and quiet period, respectively, which compares well with previous satellite measurements of 0.5 - 3.5 hours. Article in Journal/Newspaper EISCAT Lancaster University: Lancaster Eprints Geophysical Research Letters 28 7 1395 1398 |
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Open Polar |
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Lancaster University: Lancaster Eprints |
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ftulancaster |
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description |
From previous studies, it has been conclusively demonstrated that F-region thermospheric winds follow, but generally lag behind, the ion drift pattern of magnetospheric convection. Analysis of the ion-neutral momentum exchange equation shows that ion-drag and thermal pressure are the major contributors to neutral momentum forcing at F-region heights with relatively minor effects from coriolis, advection and viscous forces. An ion-neutral coupling time constant (e-folding time) has been defined which describes the time taken for the neutral gas velocity to approach the ion velocity after a step change in convection. In this study, F-region ion drift and neutral winds have been observed by the EISCAT tristatic incoherent scatter facility and a ground-based Fabry-Perot interferometer, respectively, from northern Scandinavia. The e-folding time varies in the range 0.5 - 6.5 hours, with an average of 1.8 and 3.3 hours for a geomagnetically active and quiet period, respectively, which compares well with previous satellite measurements of 0.5 - 3.5 hours. |
format |
Article in Journal/Newspaper |
author |
Kosch, M. J. Cierpka, K. Rietveld, M. T. Hagfors, T. Schlegel, K. |
spellingShingle |
Kosch, M. J. Cierpka, K. Rietveld, M. T. Hagfors, T. Schlegel, K. High-latitude ground-based observations of the thermospheric ion-drag time constant |
author_facet |
Kosch, M. J. Cierpka, K. Rietveld, M. T. Hagfors, T. Schlegel, K. |
author_sort |
Kosch, M. J. |
title |
High-latitude ground-based observations of the thermospheric ion-drag time constant |
title_short |
High-latitude ground-based observations of the thermospheric ion-drag time constant |
title_full |
High-latitude ground-based observations of the thermospheric ion-drag time constant |
title_fullStr |
High-latitude ground-based observations of the thermospheric ion-drag time constant |
title_full_unstemmed |
High-latitude ground-based observations of the thermospheric ion-drag time constant |
title_sort |
high-latitude ground-based observations of the thermospheric ion-drag time constant |
publishDate |
2001 |
url |
https://eprints.lancs.ac.uk/id/eprint/6596/ https://doi.org/10.1029/2000GL012380 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Kosch, M. J. and Cierpka, K. and Rietveld, M. T. and Hagfors, T. and Schlegel, K. (2001) High-latitude ground-based observations of the thermospheric ion-drag time constant. Geophysical Research Letters, 28 (7). pp. 1395-1398. ISSN 0094-8276 |
op_doi |
https://doi.org/10.1029/2000GL012380 |
container_title |
Geophysical Research Letters |
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28 |
container_issue |
7 |
container_start_page |
1395 |
op_container_end_page |
1398 |
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1775350391292035072 |