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|Title:||On the Criterion of Geomagnetic Field at the Time of Disappearance of Equatorial Es-q Layer|
|Authors:||Rastogi, R. G.|
|Abstract:||The condition of equatorial electrojet currents (or the electrostatic field) as derived from geomagnetic H field variation at the time of sudden disappearance of the equatorial sporadic E layer is discussed. This association between the reversed electrojet and disappearance of Es is confined to only the q type of Es, The estimate of electron drift velocity to be between 100 and 250 m/sec at the time of disappearance of Es-q by some workers seems to be in error due to the inaccuracies in defining the base level for ΔH. The disappearance of Es-q occurs precisely when the latitudinal profile of ΔH is reversed and not necessarily when ΔH at an equatorial station decreases below the nighttime level. The present criterion is not affected by the choice of the time at which the H field is taken as the base level.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.04(1) [March 1975]|
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