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THE EFFECT OF GEOMAGNETIC STORM ON VLF EMISSION AT CLEFT LATITUDES

Liao Huai-zhe   

  1. Center for Space Sciemce and Applied Research, Academic Sinica, Beijing 100080
  • Received:1995-01-14 Revised:1900-01-01 Online:1996-04-24 Published:1996-04-24

Abstract: A statistical has been carried out for the relationship between the VLF activities at dayside cleft latitudes and geomagnetic storms from Apr. 1984 to Feb. 1987. It is shown that: 1. There is an obvious effect of geomagnetic storm on the VLF emissions. 2. The VLF emission activities are affected by geomagnetic storms in a way that.there are an obvious VLF activity decrease before or during storm onset day anda large increase of the activities after geomagnetic storm. 3. The influence of Sc storm on VLF activity is different from that of Gc storm. 4. There is a characteristic seasonnal asymmetry of the effects. In local winter the VLF decrease during Sc storm onset day and the VLF increase after G. storm reaches mazimum, while in summer the decrease and the increase are small. The amplitude of the decrease and the increase in winter is 3 times as large as in summer.

Key words: Equatorial Spread-F, Solar activity, Diurnal variation, Harmonic component