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Equatorial evening prereversal vertical drift and spread F suppression by disturbance penetration electric fields
Author(s) -
Abdu M. A.,
Kherani E. A.,
Batista I. S.,
Sobral J. H. A.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl039919
Subject(s) - electric field , ionosphere , geophysics , instability , evening , penetration (warfare) , polarity reversal , polarity (international relations) , geology , electromagnetic shielding , physics , atmospheric sciences , mechanics , chemistry , astronomy , voltage , biochemistry , quantum mechanics , operations research , engineering , cell
This paper presents new evidences on the responses of the evening sector equatorial ionosphere to prompt penetrating (PP) magnetospheric electric fields. In particular we show for the first time that the evening prereversal enhancement in the vertical drift/zonal electric field (PRE) and the consequent spread F (ESF) generation can be totally suppressed by penetration electric field of westward polarity arising from over‐shielding processes. In contrast the undershielding PP electric field of eastward polarity is found to enhance the PRE and ESF in agreement with recent findings. These results are evaluated using collisional interchange instability growth rate model calculations.