Effects of the 13-14 March 1989 geomagnetic storm on the E region Tidal Ion Layer structure at Arecibo during AIDA

Details Effects of the 13-14 March 1989 geomagnetic storm on the E region Tidal Ion Layer structure at Arecibo during AIDA Effects of the 13-14 March 1989 geomagnetic storm on the E region Tidal Ion Layer structure at Arecibo during AIDA

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..467m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 3, p. 467-485.

Physics

12

Atmospheric Stratification, Atmospheric Tides, Incoherent Scatter Radar, Ion Density (Concentration), Magnetic Storms, Atmospheric Circulation, Atmospheric Ionization, Computerized Simulation, Electric Field Strength, Sporadic E Layer

Scientific paper

The formation and vertical motion of intermediate layers and so-called sporadic-E layers (80-150 km altitude) are thought to be predominantly under tidal control at middle and low latitudes. We refer to these layers as Tidal Ion Layers (TILs). Study of the time-height trajectories of TILs, derived from Incoherent Scatter Radar data obtained during the Arecibo Initiative in Dynamics of the Atmosphere campaign, reveals that layer trajectories are greatly influenced by geomagnetic activity when the Kp index rises above about 6 for periods greater than 3 h during the night-time. In particular, the large geomagnetic storm of 13-14 March 1989 resulted in the complete disruption of the TIL structure in the entire 80-150 km altitude range. We hypothesize that the layer disruption is caused by an electric field with a magnitude sufficient to overwhelm the usual V x B ion convergence mechanism. Computer simulation of ion motion allows an estimate of the strength of the electric field for the observed disturbances. The model electric field strengths required to cause TIL disruption are in the range of 0.5-3 mV/m, perpendicular to the B field, and directed anywhere between eastward and southward.

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