Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period
Study on daytime descending intermediate layer over subtropical Indian station Waltair (17.7° N, 83.3° E geographic, 6.4° N, 10° E geomagnetic, 20° N dip) located in the equatorial anomaly transition region, using an IPS 42 Digital Ionosonde during the low...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2010-03-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/28/807/2010/angeo-28-807-2010.pdf |
| _version_ | 1819097437695901696 |
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| author | K. Niranjan K. Niranjan B. Srivani V. V. S. Naidu |
| author_facet | K. Niranjan K. Niranjan B. Srivani V. V. S. Naidu |
| author_sort | K. Niranjan |
| collection | DOAJ |
| description | Study on daytime descending intermediate layer over subtropical Indian
station Waltair (17.7° N, 83.3° E geographic, 6.4° N, 10° E
geomagnetic, 20° N dip) located in the equatorial anomaly
transition region, using an IPS 42 Digital Ionosonde during the low solar
activity year 2004 showed that the layers occur in the altitude range of
140–160 km with maximum occurrence during winter solstice. The layers
observed during daytime occur with a double peak variation throughout the
year with less occurrence probability and shorter duration presence during
forenoon hours. The morning layer descent was associated with a density
increase where as during afternoon hours a decrease in density was observed.
The downward drift velocity was about 8 km/h during morning hours and
between 7–11 km/h during afternoon hours, with a low descent rate of around
4.5 km/h during summer morning hours. The results indicate the presence of a
6 h tide at this location as observed from the characteristics of the
descending layers, unlike at majority of locations where a significant semi
diurnal trend is observed. The study brings out the complex nature of the
tidal interaction at different locations. |
| first_indexed | 2024-12-22T00:15:05Z |
| format | Article |
| id | doaj.art-03a754825b4e4743a41412d2869442a3 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-22T00:15:05Z |
| publishDate | 2010-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-03a754825b4e4743a41412d2869442a32022-12-21T18:45:19ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762010-03-012880781510.5194/angeo-28-807-2010Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity periodK. Niranjan0K. Niranjan1B. Srivani2V. V. S. Naidu3Department of Physics, Andhra University, Visakhapantam 530 003, IndiaGraduate School of Environmental Studies, Nagoya University, Nagoya, JapanDepartment of Physics, GITAM University Hyderabad campus, Hyderabad, IndiaDepartment of Physics, Andhra University, Visakhapantam 530 003, IndiaStudy on daytime descending intermediate layer over subtropical Indian station Waltair (17.7° N, 83.3° E geographic, 6.4° N, 10° E geomagnetic, 20° N dip) located in the equatorial anomaly transition region, using an IPS 42 Digital Ionosonde during the low solar activity year 2004 showed that the layers occur in the altitude range of 140–160 km with maximum occurrence during winter solstice. The layers observed during daytime occur with a double peak variation throughout the year with less occurrence probability and shorter duration presence during forenoon hours. The morning layer descent was associated with a density increase where as during afternoon hours a decrease in density was observed. The downward drift velocity was about 8 km/h during morning hours and between 7–11 km/h during afternoon hours, with a low descent rate of around 4.5 km/h during summer morning hours. The results indicate the presence of a 6 h tide at this location as observed from the characteristics of the descending layers, unlike at majority of locations where a significant semi diurnal trend is observed. The study brings out the complex nature of the tidal interaction at different locations.https://www.ann-geophys.net/28/807/2010/angeo-28-807-2010.pdf |
| spellingShingle | K. Niranjan K. Niranjan B. Srivani V. V. S. Naidu Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period Annales Geophysicae |
| title | Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period |
| title_full | Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period |
| title_fullStr | Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period |
| title_full_unstemmed | Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period |
| title_short | Daytime descending intermediate layers observed over a sub-tropical Indian station Waltair during low-solar activity period |
| title_sort | daytime descending intermediate layers observed over a sub tropical indian station waltair during low solar activity period |
| url | https://www.ann-geophys.net/28/807/2010/angeo-28-807-2010.pdf |
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