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Transient composite electric field disturbances near dip equator associated with auroral substorms

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dc.contributor.author Sastri, J. H
dc.contributor.author Ramesh, K. B
dc.contributor.author Rao, H. N. R
dc.date.accessioned 2009-08-10T14:51:52Z
dc.date.available 2009-08-10T14:51:52Z
dc.date.issued 1992-07
dc.identifier.citation Geophysical Research Letters, Vol. 19, No. 14, pp. 1451 - 1454 en
dc.identifier.issn 0094-8276
dc.identifier.uri http://hdl.handle.net/2248/4747
dc.description Open Access
dc.description.abstract Ionosonde data of Kodaikanal (Geog.Long. 77° 29′E, dip 3.0°N) and Huancayo (Geog.Long. 75°18′W, dip 2.0°N) are used to show the simultaneous occurrence of a transient disturbance in F region height of composite polarity in day and night sectors near the dip equator during the auroral substorm activity on 20 August 1979. At Kodaikanal which is on the nightside at the time of the substorm activity, h′F first underwent an abrupt and rapid decrease (80km in 1 hr) followed by a much larger increase (120km in 1 hr). Perturbation in hpF2 of exactly opposite polarity was simultaneously seen at Huancayo which is on the dayside. The decrease in h′F at Kodaikanal (increase in hpF2 at Huancayo) occurred in association with an increase in polar cap potential drop, ø (estimated from IMF parameters), and the subsequent increase (decrease at Huancayo) with a decrease in polar cap potential. The F‐region height disturbance is interpreted as the manifestation of a global transient composite disturbance in equatorial zonal electric field caused by the prompt penetration of substorm‐related high latitude electric fields into the equatorial ionosphere. The polarity pattern of the electric field disturbance is consistent with the global convection models which predict westward (eastward) electric fields at night (by day) near the geomagnetic equator in response to an increase in polar cap potential drop, and fields of opposite signs for a decrease in polar cap potential. en
dc.language.iso en en
dc.publisher American Geophysical Union en
dc.relation.uri http://dx.doi.org/10.1029/92GL01447 en
dc.rights © American Geophysical Union en
dc.subject Auroral Electrojets en
dc.subject Earth Magnetosphere en
dc.subject Electric Fields en
dc.subject Magnetic Equator en
dc.subject Polar Substorms en
dc.subject F Region en
dc.subject Ionospheric Drift en
dc.title Transient composite electric field disturbances near dip equator associated with auroral substorms en
dc.type Article en

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