Simultaneous observations of Syowa East HF radar and Zhongshan Station optical aurora associated with the solar wind negative pressure impulse

N. Sato; Y. Murata; H. Yamagishi; A. S. Yukimatu; M. Kikuchi; K. Makita

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RESEARCH-ARTICLE

Simultaneous observations of Syowa East HF radar and Zhongshan Station optical aurora associated with the solar wind negative pressure impulse

N. Sato1, Y. Murata1, H. Yamagishi1, A. S. Yukimatu1, M. Kikuchi1, K. Makita2 1, 3 3

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Vol. 10, Issue 2, pp. 81-87 (1999) •

First published at: Jun 01, 1999

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Abstract

The field of views of the Syowa East HF radar covers over Zhongshan Station (magnetic latitude ~ 74. 5°S). We examined the relation between HF radar signatures and optical aurora by using the data obtained on 3 Augusl 1997. A geomagnetic negative sudden impulse (SI-) occurred at ~ 1432 UT on 3 August 1997associated with the sudden decrease of solar wind plasma density. From the behavior of the optical aurora observed by all-sky TV camera and scanning photometers at Zhongshan Station, a sudden enhancement of auroral emission intensity and poleward moving signature occurred associated with the negative SI. It is intcresting that the temporal and spatial variations of the HF radar backscatter power showed one to one correlations with optical aurora data. The details of this event are examined and compared with the data onboard WIND sate1lite and from ground based magnetometers.

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