dc.contributor.author | Sastri, J. H | |
dc.contributor.author | Varma, V. K. M | |
dc.contributor.author | Nayar, S. R. P | |
dc.date.accessioned | 2008-08-05T07:55:57Z | |
dc.date.available | 2008-08-05T07:55:57Z | |
dc.date.issued | 1995-10 | |
dc.identifier.citation | Geophysical Research Letters, Vol. 22, No. 19, pp. 2645 - 2648 | en |
dc.identifier.issn | 0094-8276 | |
dc.identifier.uri | http://hdl.handle.net/2248/3027 | |
dc.description.abstract | Simultaneous measurements of F-region vertical drift are made in the evening hours (1700-2100 IST) at Trivandrum (dip 0.6°N) and Kodaikanal (dip 4°N) on fifteen days during December 1993- January 1994 using the HF phase path technique on two different probing frequencies. The data are used to study the height dependence of vertical plasma drift in the bottomside F-region in the dusk sector after correcting the drifts (at Kodaikanal) for meridional wind effects and chemical loss.<p>It is found that growth and decay of a positive height gradient in vertical drift occurs fairly regularly in the dusk period. On the average the verticity gradient is positive in the interval 1815-1925 IST and is preceded by negative values. The positive height gradient of vertical plasma drift below the F layer peak is interpreted in terms of altitude dependence of the relative contributions of E and F region dynamos to the electric fields responsible for plasma drifts (vertical and zonal) of the dusktime equatorial F-region. These results are for winter solstice solar minimum conditions. . | en |
dc.format.extent | 3894 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | en |
dc.publisher | American Geophysical Union | en |
dc.relation.uri | http://www.agu.org/pubs/crossref/1995/95GL02668.shtml | en |
dc.subject | Ionosphere: Equatorial Ionosphere | en |
dc.subject | Ionosphere: Electric Fields | en |
dc.subject | Ionosphere: Ionospheric Disturbances | en |
dc.title | Height gradient of F region vertical drift in the evening equatorial ionosphere | en |
dc.type | Article | en |