dc.contributor.author |
Abdu, M. A |
|
dc.contributor.author |
Sastri, J. H |
|
dc.contributor.author |
Luhr, H |
|
dc.contributor.author |
Tachihara, H |
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dc.contributor.author |
Kitamura, T |
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dc.contributor.author |
Trivedi, N. B |
|
dc.contributor.author |
Sobral, J. H. A |
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dc.date.accessioned |
2008-08-18T07:10:43Z |
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dc.date.available |
2008-08-18T07:10:43Z |
|
dc.date.issued |
1998-05 |
|
dc.identifier.citation |
Geophysical Research Letters, Vol. 25, No. 9, pp. 1511 - 1514 |
en |
dc.identifier.issn |
0094-8276 |
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dc.identifier.uri |
http://hdl.handle.net/2248/3164 |
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dc.description |
Open Access |
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dc.description.abstract |
We have studied the geomagnetic and ionospheric manifestations of the DP 2 activity that occurred on April 7, 1995 using high time resolution magnetometer data of IMAGE network in Scandinavia and of Alcantara (dip 1.2° N), Brazil, and F layer vertical plasma drift, Vz measured by an HF Doppler radar at Kodaikanal (dip 4° N), India. Quasi-periodic fluctuations in dusk-time (1730-1900 LT) F layer vertical plasma drift (eastward electric field) occurred over Kodaikanal coherent with DP 2 type magnetic fluctuations (period ≈ 25 min) at the day-side dip equator and auroral/subauroral latitudes. This first-ever observation at the dusk-side equator is in agreement with the two-cell equivalent current system previously proposed for DP 2 fluctuations. The results strongly suggest that the magnetospheric electric field responsible for DP 2 fluctuations penetrates to equatorial ionosphere on the dusk-side as on the day-side. An additional observation is that the electric field fluctuation amplitude increases towards the nightside suggesting the influence of dusk sector electrodynamics in the observed signature of the DP 2 electric field. |
en |
dc.format.extent |
3894 bytes |
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dc.format.mimetype |
application/pdf |
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dc.language.iso |
en |
en |
dc.publisher |
American Geophysical Union |
en |
dc.relation.uri |
http://www.agu.org/pubs/crossref/1998/98GL01096.shtml |
en |
dc.subject |
Ionosphere: Electric fields |
en |
dc.subject |
Magnetospheric Physics: Current systems |
en |
dc.subject |
Ionosphere: Ionosphere/magnetosphere interactions |
en |
dc.title |
DP 2 electric field fluctuations in the dusk-time dip equatorial ionosphere |
en |
dc.type |
Article |
en |