|
|
 |
|
|
Ann. Geophys., 20, 1851-1855, 2002
www.ann-geophys.net/20/1851/2002/
© European Geosciences Union 2002
Characterizations of the diurnal shapes of OI 630.0 nm dayglow intensity variations: inferences
D. Chakrabarty1, R. Sekar1, H. Chandra1, R. Narayanan1, B. M. Pathan2, and K. S. V. Subbarao3
1Physical Research Laboratory, Ahmedabad, 38 0009, India
2Indian Institute of Geomagnetism, Kolaba, Mumbai, 400 005, India
3Space Physics Laboratory,Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, India
Correspondence to: D. Chakrabarty (dipu@prl.ernet.in)
Abstract. Measurements of OI 630.0 nm thermospheric
dayglow emission by means of the Dayglow Photometer (DGP) at Mt. Abu (24.6° N,
73.7° E, dip lat 19.09° N), a station under the crest of Equatorial
Ionization Anomaly (EIA), reveal day-to-day changes in the shapes of the
diurnal profiles of dayglow intensity variations. These shapes have been
characterized using the magnetometer data from equatorial and low-latitude
stations. Substantial changes have been noticed in the shapes of the dayglow
intensity variations between 10:00–15:00 IST (Indian Standard Time) during
the days when normal and counter electrojet events are present over the
equator. It is found that the width (the time span corresponding to 0.8 times
the maximum dayglow intensity) of the diurnal profile has a linear relationship
with the integrated electrojet strength. Occasional deviation from this linear
relationship is attributed to the presence of substantial mean meridional
wind.
Key words. Ionosphere (equatorial ionosphere;
ionosphere – atmosphere interactions; ionospheric disturbances)
Full Article in PDF (1461 KB) |
|
|
