 |
| Titel |
Ionospheric response to total solar eclipse of 22 July 2009 in different Indian regions |
| VerfasserIn |
S. Kumar, A. K. Singh, R. P. Singh |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 9 ; Nr. 31, no. 9 (2013-09-09), S.1549-1558 |
| Datensatznummer |
250086106
|
| Publikation (Nr.) |
 copernicus.org/angeo-31-1549-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The variability of ionospheric response to the total solar eclipse of 22
July 2009 has been studied analyzing the GPS
data recorded at the four Indian low-latitude stations Varanasi (100%
obscuration), Kanpur (95% obscuration), Hyderabad (84% obscuration)
and Bangalore (72% obscuration).
The retrieved ionospheric vertical total electron content (VTEC) shows a significant reduction (reflected by
all PRNs (satellites) at all stations) with a maximum of 48% at
Varanasi (PRN 14), which decreases to 30% at Bangalore (PRN 14). Data
from PRN 31 show a maximum of 54% at Kanpur and 26% at Hyderabad.
The maximum decrement in VTEC occurs some time (2–15 min) after the
maximum obscuration. The reduction in VTEC compared to the quiet mean VTEC
depends on latitude as well as longitude, which also depends on the location
of the satellite with respect to the solar eclipse path. The amount of
reduction in VTEC decreases as the present obscuration decreases, which is
directly related to the electron production by the photoionization
process. The analysis of electron density height profile derived from the
COSMIC (Constellation Observing System for Meteorology, Ionosphere &
Climate) satellite over the Indian region shows significant reduction from
100 km altitude up to 800 km altitude with a maximum of 48% at 360 km
altitude. The oscillatory nature in total electron content data at all
stations is observed with different wave periods lying between 40 and
120 min, which are attributed to gravity wave effects generated in the lower
atmosphere during the total solar eclipse. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|