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

Abstract

Ionosonde data of Kodaikanal and Huancayo 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[prime]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[prime]F at Kodaikana (increase in hpF2 at Huancayo) occurred in association with an increase in polar cap potential drop, [phi] (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 equatormore » in response to an increase in polar cap potential drop, and fields of opposite signs for a decrease in polar cap potential.« less

Authors:
; ;  [1]
  1. Indian Inst. of Astrophysics, Bangalore (India)
Publication Date:
OSTI Identifier:
7012720
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters (American Geophysical Union); (United States)
Additional Journal Information:
Journal Volume: 19:14; Journal ID: ISSN 0094-8276
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; F REGION; ELECTRIC FIELDS; DATA; DISTURBANCES; EARTH MAGNETOSPHERE; ELECTRIC POTENTIAL; GEOMAGNETIC EQUATOR; IONOSONDES; LATITUDE EFFECT; MAGNETIC BAYS; PLASMA DRIFT; POLAR REGIONS; EARTH ATMOSPHERE; ELECTRONIC EQUIPMENT; EQUIPMENT; GEOGRAPHICAL VARIATIONS; INFORMATION; IONOSPHERE; PLANETARY IONOSPHERES; RADIO EQUIPMENT; VARIATIONS; 661320* - Auroral, Ionospheric, & Magnetospheric Phenomena- (1992-)

Citation Formats

Hanumath Sastri, J, Ramesh, K B, and Ranganath Rao, H N. Transient composite electric field disturbances near dip equator associated with auroral substorms. United States: N. p., 1992. Web. doi:10.1029/92GL01447.
Hanumath Sastri, J, Ramesh, K B, & Ranganath Rao, H N. Transient composite electric field disturbances near dip equator associated with auroral substorms. United States. https://doi.org/10.1029/92GL01447
Hanumath Sastri, J, Ramesh, K B, and Ranganath Rao, H N. 1992. "Transient composite electric field disturbances near dip equator associated with auroral substorms". United States. https://doi.org/10.1029/92GL01447.
@article{osti_7012720,
title = {Transient composite electric field disturbances near dip equator associated with auroral substorms},
author = {Hanumath Sastri, J and Ramesh, K B and Ranganath Rao, H N},
abstractNote = {Ionosonde data of Kodaikanal and Huancayo 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[prime]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[prime]F at Kodaikana (increase in hpF2 at Huancayo) occurred in association with an increase in polar cap potential drop, [phi] (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.},
doi = {10.1029/92GL01447},
url = {https://www.osti.gov/biblio/7012720}, journal = {Geophysical Research Letters (American Geophysical Union); (United States)},
issn = {0094-8276},
number = ,
volume = 19:14,
place = {United States},
year = {Fri Jul 24 00:00:00 EDT 1992},
month = {Fri Jul 24 00:00:00 EDT 1992}
}