Physical mechanism of strong negative storm e ects in the daytime ionospheric F 2 region observed with EISCAT

  title={Physical mechanism of strong negative storm e ects in the daytime ionospheric F 2 region observed with EISCAT},
  author={A. Mikhailov and Karin Schlegel},
A self-consistent method for daytime F-region modelling was applied to EISCAT observations during two periods comprising the very disturbed days 3 April 1992 and 10 April 1990. The observed strong Ne decrease at F2-layer heights originated from di€erent physical mechanisms in the two cases. The negative F2layer storm e€ect with an NmF2 decrease by a factor of 6.4 on 3 April 1992 was produced by enhanced electric ®elds (E » 85 mV/m) and strong downward plasma drifts, but without any noticeable… CONTINUE READING

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