Post-noon ionospheric absorption observed by the imaging riometers at polar cust/cap conjugate stations

An example of post-noon ionospheric absorption observed by the imaging riometers at Ny-Alesund / Danmarkshavn in the arctic region and Zhongshan Station in Antarctic is presented. The post-noon absorption observed simultaneously between the hemispherical stations was a spike-type with weak intensity...

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Bibliographic Details
Main Authors: Nishino, Masanori, Yamagishi, Hisao, Sato, Natuo, Murata, Y., Ruiyuan, Liu, Hongqiao, Hu, Stauning, P., Holtet, J. A.
Format: Article in Journal/Newspaper
Language:English
Published: Polar Research Institute of China - PRIC 1999
Subjects:
Arctic
Antarctic
Zhongshan
Zhongshan Station
Danmarkshavn
Advances in Polar Science
Antarc*
Polar Science
Online Access:http://library.arcticportal.org/2184/
http://library.arcticportal.org/2184/1/A199902007.pdf
Description
Summary:An example of post-noon ionospheric absorption observed by the imaging riometers at Ny-Alesund / Danmarkshavn in the arctic region and Zhongshan Station in Antarctic is presented. The post-noon absorption observed simultaneously between the hemispherical stations was a spike-type with weak intensity (< 1 dB) during the high solar wind dynamic pressure. The absorption spikes might be caused by precipitation of high-energy electrons (30 - 300 keV) in the closed dayside magnetosphere. It should be noted that the precipitation region of the absorption spike associated with the steep pressure increase (~ 13 nPa) was localized and shifted equatorward.

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