Ionospheric absorption at Zhongshan Station, Antarctica during magnetic storms in early May, 1998

• Main Authors: Ruiyuan, Liu, Longsong, He, Hongqiao, Hu, Yonghua, Liu
• Format: Article in Journal/Newspaper
• Language: English
• Published: Polar Research Institute of China - PRIC 1999
• Subjects: Zhongshan; Zhongshan Station; Advances in Polar Science; Antarc*; Antarctica; Polar Science
• Online Access: http://library.arcticportal.org/2185/; http://library.arcticportal.org/2185/1/A199902008.pdf

In the paper the high latitude ionospheric absorption events, monitored by an imaging riometer at Zhongshan Station, Antarctica, are examined during magnetic storms in early May 1998. The storm absorption at ~0639 UT on May 2 was mainly an equatorward progressing absorption event, which were associated with a strong negative bay of the magnetic H component and with a large Pc3 range pulsation. There was a time lag of about 1.5 hours between the onset of the ionospheric disturbance and the IMF southward turning in the solar wind. The event at 2222 UT on May 2 was a typical midnight absorption spike event. The absorption region took the form of an elongated strip with the length of 100 - 150 km and the width of 30 - 40 km. The absorption during 0830 - 1200 UT on May 6 was a polar cap absorption (PCA) event, caused by intense precipitation of high-energy protons erupted after a large solar flare explosion.