Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997
We present the statistical relationship between the echo power and Doppler velocity of radar echoes observed with the Syowa East HF radar in Antarctica in 1997. The objective of this analysis was to clarify the mechanisms by which high-latitude (~75° magnetic latitude) F region irregularities are ge...
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ftnipr:oai:nipr.repo.nii.ac.jp:00006306 2023-05-15T13:44:43+02:00 Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 Masaaki Fukumoto Nozomu Nishitani Tadahiko Ogawa Natsuo Sato Hisao Yamagishi Akira Sessai Yukimatu 2000-08 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6306 http://id.nii.ac.jp/1291/00006306/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6306&item_no=1&attribute_id=18&file_no=1 en eng Solar-Terrestrial Environment Laboratory, Nagoya University/Solar-Terrestrial Environment Laboratory, Nagoya University/Solar-Terrestrial Environment Laboratory, Nagoya University/National Institute of Polar Research/National Institute of Polar Research/National Institute of Polar Research National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6306 http://id.nii.ac.jp/1291/00006306/ AA11397422 Advances in polar upper atmosphere research, 14, 93-102(2000-08) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6306&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 2000 ftnipr 2023-03-18T20:23:29Z We present the statistical relationship between the echo power and Doppler velocity of radar echoes observed with the Syowa East HF radar in Antarctica in 1997. The objective of this analysis was to clarify the mechanisms by which high-latitude (~75° magnetic latitude) F region irregularities are generated. Although data points are scattered over a large area, a positive correlation between Doppler velocity and echo power appears to be present. This relationship can be interpreted in terms of gradient-drift instability, which is the most probable cause of the decameter-scale irregularities in the F region. The positive correlation deteriorates in the afternoon and midnight sectors, probably as a result of other mechanisms related to particle precipitation (field-aligned current), such as the current-convective instability. Report Antarc* Antarctica Advances in polar upper atmosphere research National Institute of Polar Research Repository, Japan |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
We present the statistical relationship between the echo power and Doppler velocity of radar echoes observed with the Syowa East HF radar in Antarctica in 1997. The objective of this analysis was to clarify the mechanisms by which high-latitude (~75° magnetic latitude) F region irregularities are generated. Although data points are scattered over a large area, a positive correlation between Doppler velocity and echo power appears to be present. This relationship can be interpreted in terms of gradient-drift instability, which is the most probable cause of the decameter-scale irregularities in the F region. The positive correlation deteriorates in the afternoon and midnight sectors, probably as a result of other mechanisms related to particle precipitation (field-aligned current), such as the current-convective instability. |
format |
Report |
author |
Masaaki Fukumoto Nozomu Nishitani Tadahiko Ogawa Natsuo Sato Hisao Yamagishi Akira Sessai Yukimatu |
spellingShingle |
Masaaki Fukumoto Nozomu Nishitani Tadahiko Ogawa Natsuo Sato Hisao Yamagishi Akira Sessai Yukimatu Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 |
author_facet |
Masaaki Fukumoto Nozomu Nishitani Tadahiko Ogawa Natsuo Sato Hisao Yamagishi Akira Sessai Yukimatu |
author_sort |
Masaaki Fukumoto |
title |
Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 |
title_short |
Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 |
title_full |
Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 |
title_fullStr |
Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 |
title_full_unstemmed |
Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997 |
title_sort |
statistical study of doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the syowa east hf radar in 1997 |
publisher |
Solar-Terrestrial Environment Laboratory, Nagoya University/Solar-Terrestrial Environment Laboratory, Nagoya University/Solar-Terrestrial Environment Laboratory, Nagoya University/National Institute of Polar Research/National Institute of Polar Research/National Institute of Polar Research |
publishDate |
2000 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6306 http://id.nii.ac.jp/1291/00006306/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6306&item_no=1&attribute_id=18&file_no=1 |
genre |
Antarc* Antarctica Advances in polar upper atmosphere research |
genre_facet |
Antarc* Antarctica Advances in polar upper atmosphere research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6306 http://id.nii.ac.jp/1291/00006306/ AA11397422 Advances in polar upper atmosphere research, 14, 93-102(2000-08) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6306&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766205257082208256 |