Polar cap patches and auroral blobs observed with Antarctic HF radars: Preliminary results

We present preliminary results of the Antarctic HF radar observations of decameter-scale irregularities associated with polar cap patches and auroral blobs in the southern high latitude ionosphere. Somewhat surprisingly, patches appear even under northward interplanetary magnetic field (IMF) conditi...

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Bibliographic Details
Main Authors: Tadahiko Ogawa, Nozomu Nishitani, Mike Pinnock, Natsuo Sato, Hisao Yamagishi, Akira Sessai Yukimatu
Format: Report
Language:English
Published: Solar-Terrestrial Environment Laboratory, Nagoya University/Solar-Terrestrial Environment Laboratory, Nagoya University/British Antarctic Survey/National Institute of Polar Research/National Institute of Polar Research/National Institute of Polar Research 1998
Subjects:
Antarctic
The Antarctic
Antarc*
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4233
http://id.nii.ac.jp/1291/00004233/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4233&item_no=1&attribute_id=18&file_no=1
Description
Summary:We present preliminary results of the Antarctic HF radar observations of decameter-scale irregularities associated with polar cap patches and auroral blobs in the southern high latitude ionosphere. Somewhat surprisingly, patches appear even under northward interplanetary magnetic field (IMF) conditions. These patches seem to have been transported from the dayside cusp into the polar cap, although we need more data analysis to confirm this conclusion. The blobs, clearly detected with the Halley radar, in the evening auroral zone seem to be well explained by previous simulations that calculated the time evolution of a patch initially located in the polar cap.

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