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THE EFFECT OF IMF By ON THE MLT DISTRIBUTION OF THE OCCURRENCE OF VLF HISS

Tian Bao-ning   

  1. Ceater for Space Science and Applied Research, Academia Sinica, Beijing 100080
  • Received:1995-04-18 Revised:1900-01-01 Online:1996-04-24 Published:1996-04-24

Abstract: The effect of the interplanetary magnetic field dawn-dusk component (IMF By) on the MLT distribution of VLF hiss occurrence is analysed in this paper by using 31-38kHz VLF data observed at the south pole station (invarent latitude about 75°). It is foUnd that IMF By influnces the distribution of the VLF occurrence stronly, especially at the day side. The asymmytry of VLF occurrence at pre-noon MLT region and at post-noon MLT region at cusp latitude exists.The peak of the VLF occurrence is much more higher at post-noon sector than at pre-noon sector when positive By but the peak of VLF occurrence at postnoon becomes bigger when is negative By. This By control is related to the By control of magnetospheric plasma convection patterns and the distribution of electrons precipitation.

Key words: F1 ledge, Neural networks, Ensemble Kalman Filter (EnKF), Ionospheric forecast