On the determination of ion temperature in the auroral F-region ionosphere
Assessment is made of the effect of the assumed form for the ion velocity distribution function on estimates of three-dimensional ion temperature from one-dimensional observations. Incoherent scatter observations by the EISCAT radar at a variety of aspect angles are used to demonstrate features of i...
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1988
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Online Access: | https://centaur.reading.ac.uk/38890/ https://doi.org/10.1016/0032-0633(88)90080-3 |
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ftunivreading:oai:centaur.reading.ac.uk:38890 2024-09-15T18:04:29+00:00 On the determination of ion temperature in the auroral F-region ionosphere Lockwood, Mike Winser, K.J. 1988 https://centaur.reading.ac.uk/38890/ https://doi.org/10.1016/0032-0633(88)90080-3 unknown Elsevier Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 and Winser, K.J. (1988) On the determination of ion temperature in the auroral F-region ionosphere. Planetary and Space Science, 36 (11). pp. 1295-1304. ISSN 0032-0633 doi: https://doi.org/10.1016/0032-0633(88)90080-3 <https://doi.org/10.1016/0032-0633(88)90080-3> Article PeerReviewed 1988 ftunivreading https://doi.org/10.1016/0032-0633(88)90080-3 2024-06-25T14:57:10Z Assessment is made of the effect of the assumed form for the ion velocity distribution function on estimates of three-dimensional ion temperature from one-dimensional observations. Incoherent scatter observations by the EISCAT radar at a variety of aspect angles are used to demonstrate features of ion temperature determination and to study the ion velocity distribution function. One form of the distribution function which has recently been widely used In the interpretation of EISCAT measurements, is found to be consistent with the data presented here, in that no deviation from a Maxwellian can be detected for observations along the magnetic field line and that the ion temperature and its anisotropy are accurately predicted. It is shown that theoretical predictions of the anisotropy by Monte Carlo computations are very accurate, the observed value being greater by only a few percent. It is also demonstrated for the case studied that errors of up to 93% are introduced into the ion temperature estimate if the anisotropy is neglected. Observations at an aspect angle of 54.7°, which are not subject to this error, have a much smaller uncertainty (less than 1%) due to the adopted form of the distribution of line-of-sight velocity. Article in Journal/Newspaper EISCAT CentAUR: Central Archive at the University of Reading Planetary and Space Science 36 11 1295 1304 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
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unknown |
description |
Assessment is made of the effect of the assumed form for the ion velocity distribution function on estimates of three-dimensional ion temperature from one-dimensional observations. Incoherent scatter observations by the EISCAT radar at a variety of aspect angles are used to demonstrate features of ion temperature determination and to study the ion velocity distribution function. One form of the distribution function which has recently been widely used In the interpretation of EISCAT measurements, is found to be consistent with the data presented here, in that no deviation from a Maxwellian can be detected for observations along the magnetic field line and that the ion temperature and its anisotropy are accurately predicted. It is shown that theoretical predictions of the anisotropy by Monte Carlo computations are very accurate, the observed value being greater by only a few percent. It is also demonstrated for the case studied that errors of up to 93% are introduced into the ion temperature estimate if the anisotropy is neglected. Observations at an aspect angle of 54.7°, which are not subject to this error, have a much smaller uncertainty (less than 1%) due to the adopted form of the distribution of line-of-sight velocity. |
format |
Article in Journal/Newspaper |
author |
Lockwood, Mike Winser, K.J. |
spellingShingle |
Lockwood, Mike Winser, K.J. On the determination of ion temperature in the auroral F-region ionosphere |
author_facet |
Lockwood, Mike Winser, K.J. |
author_sort |
Lockwood, Mike |
title |
On the determination of ion temperature in the auroral F-region ionosphere |
title_short |
On the determination of ion temperature in the auroral F-region ionosphere |
title_full |
On the determination of ion temperature in the auroral F-region ionosphere |
title_fullStr |
On the determination of ion temperature in the auroral F-region ionosphere |
title_full_unstemmed |
On the determination of ion temperature in the auroral F-region ionosphere |
title_sort |
on the determination of ion temperature in the auroral f-region ionosphere |
publisher |
Elsevier |
publishDate |
1988 |
url |
https://centaur.reading.ac.uk/38890/ https://doi.org/10.1016/0032-0633(88)90080-3 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 and Winser, K.J. (1988) On the determination of ion temperature in the auroral F-region ionosphere. Planetary and Space Science, 36 (11). pp. 1295-1304. ISSN 0032-0633 doi: https://doi.org/10.1016/0032-0633(88)90080-3 <https://doi.org/10.1016/0032-0633(88)90080-3> |
op_doi |
https://doi.org/10.1016/0032-0633(88)90080-3 |
container_title |
Planetary and Space Science |
container_volume |
36 |
container_issue |
11 |
container_start_page |
1295 |
op_container_end_page |
1304 |
_version_ |
1810441975044767744 |