Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region
The systematic time differences observed in the onset of postsunset VHF scintillations recorded simultaneously at Ujjain (Geogr. lat. 23.2<sup>°</sup>N, Geogr. long. 75.6<sup>°</sup>E) and Bhopal (Geogr. lat. 23.2<sup>°</sup>N, Geogr. long. 77.6<sup>°<...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1995-07-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/13/724/1995/angeo-13-724-1995.pdf |
| _version_ | 1818344050364776448 |
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| author | S. Kumar A. K. Gwal B. M. Pathan D. R. K. Rao |
| author_facet | S. Kumar A. K. Gwal B. M. Pathan D. R. K. Rao |
| author_sort | S. Kumar |
| collection | DOAJ |
| description | The systematic time differences observed in
the onset of postsunset VHF scintillations recorded simultaneously at Ujjain (Geogr.
lat. 23.2<sup>°</sup>N, Geogr. long. 75.6<sup>°</sup>E) and Bhopal (Geogr.
lat. 23.2<sup>°</sup>N, Geogr. long. 77.6<sup>°</sup>E), situated at the peak
of the anomaly crest in the Indian region, have been analysed to determine the
zonal drifts of scintillation-producing irregularities. The method is based on
the assumption that the horizontal movement of irregularities does not change
while crossing the F-region cross-over points of these stations. The calculated
velocities of irregularities indicate an eastward drift decreasing from about
180 m s<sup>–1</sup> to 55 m s<sup>–1</sup> during the course of night. In the
premidnight period, the drifts are reduced under the magnetically disturbed
conditions. The average east-west extension of irregularites is found to be in
the range of 200–500 km. |
| first_indexed | 2024-12-13T16:40:19Z |
| format | Article |
| id | doaj.art-0404a96691e14a7c942c4aee75567564 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-13T16:40:19Z |
| publishDate | 1995-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-0404a96691e14a7c942c4aee755675642022-12-21T23:38:18ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761995-07-011372472910.1007/s00585-995-0724-5Zonal drifts of ionospheric irregularities at temperate latitude in the Indian regionS. KumarA. K. GwalB. M. PathanD. R. K. RaoThe systematic time differences observed in the onset of postsunset VHF scintillations recorded simultaneously at Ujjain (Geogr. lat. 23.2<sup>°</sup>N, Geogr. long. 75.6<sup>°</sup>E) and Bhopal (Geogr. lat. 23.2<sup>°</sup>N, Geogr. long. 77.6<sup>°</sup>E), situated at the peak of the anomaly crest in the Indian region, have been analysed to determine the zonal drifts of scintillation-producing irregularities. The method is based on the assumption that the horizontal movement of irregularities does not change while crossing the F-region cross-over points of these stations. The calculated velocities of irregularities indicate an eastward drift decreasing from about 180 m s<sup>–1</sup> to 55 m s<sup>–1</sup> during the course of night. In the premidnight period, the drifts are reduced under the magnetically disturbed conditions. The average east-west extension of irregularites is found to be in the range of 200–500 km.https://www.ann-geophys.net/13/724/1995/angeo-13-724-1995.pdf |
| spellingShingle | S. Kumar A. K. Gwal B. M. Pathan D. R. K. Rao Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region Annales Geophysicae |
| title | Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region |
| title_full | Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region |
| title_fullStr | Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region |
| title_full_unstemmed | Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region |
| title_short | Zonal drifts of ionospheric irregularities at temperate latitude in the Indian region |
| title_sort | zonal drifts of ionospheric irregularities at temperate latitude in the indian region |
| url | https://www.ann-geophys.net/13/724/1995/angeo-13-724-1995.pdf |
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