Statistical study of Doppler velocity and echo power around 75゜ magnetic latitude using data obtained with the Syowa East HF radar in 1997

P(論文) 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...

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Bibliographic Details
Main Authors: Fukumoto, Masaaki, Nishitani, Nozomu, Ogawa, Tadahiko, Sato, Natsuo, Yamagishi, Hisao, Yukimatu, Akira Sessai
Language:English
Published: National Institute of Polar Research 2000
Subjects:
Antarc*
Antarctica
Advances in polar upper atmosphere research
Online Access:https://nipr.repo.nii.ac.jp/record/6306/files/KJ00000048046.pdf
https://doi.org/10.15094/00006306
https://nipr.repo.nii.ac.jp/records/6306
Description
Summary:P(論文) 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. departmental bulletin paper

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