Article (Scientific journals)
Parallel plate capacitor analogy of equatorial plasma bubble and associated fringe fields with implications to equatorial valley region irregularities
Mukherjee, Sampath; Patra, A. K.
2014In Journal of Geophysical Research, 119, p. 6631
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Keywords :
fringe field; valley region irregularities; plasma bubble; Physics - Space Physics; Physics - Fluid Dynamics
Abstract :
[en] VHF radar echoes from the valley region plasma irregularities, displaying ascending pattern, are often observed during the active phase of equatorial plasma bubble in the close vicinity of the geomagnetic equator and have been attributed to bubble-related fringe field effect. These irregularities however are not observed at a few degrees away from the equator. In this paper, we attempt to understand this contrasting observational result by comparing fringe field at the geomagnetic equator and low latitudes. We use parallel plate capacitor analogy of equatorial plasma bubble and choose a few capacitor configurations, consistent with commonly observed dimension and magnetic field-aligned property of plasma bubble, for computing fringe field. Results show that fringe field decreases significantly with decreasing altitude as expected. Further, fringe field decreases remarkably with latitude, which clearly indicates the role of magnetic field-aligned property of plasma bubble in reducing the magnitude of fringe field at low latitudes compared to that at the geomagnetic equator. The results are presented and discussed in the light of current understanding of plasma bubble-associated fringe field-induced plasma irregularities in the valley region.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mukherjee, Sampath ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Patra, A. K.;  National Atmospheric Research Laboratory, Gadanki, India)
Language :
English
Title :
Parallel plate capacitor analogy of equatorial plasma bubble and associated fringe fields with implications to equatorial valley region irregularities
Publication date :
01 August 2014
Journal title :
Journal of Geophysical Research
ISSN :
0148-0227
eISSN :
2156-2202
Publisher :
Wiley
Volume :
119
Pages :
6631
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 January 2021

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