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Studies of electron and ion temperatures at 500 km altitude during sunrise using Indian SROSS C2 satellite
Solar dependence of electron and ion temperatures ( T e and T i) in the ionosphere is studied using RPA data onboard SROSS C2 at an altitude of ∼500 km and 77°E longitude during early morning hours (04:00–07:00 LT) for three solar activities: solar minimum, moderate and maximum during winter, summer...
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Published in: | Advances in space research 2009-01, Vol.43 (2), p.273-281 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | Solar dependence of electron and ion temperatures (
T
e and
T
i) in the ionosphere is studied using RPA data onboard SROSS C2 at an altitude of ∼500
km and 77°E longitude during early morning hours (04:00–07:00
LT) for three solar activities: solar minimum, moderate and maximum during winter, summer and equinox months in 10°S–20°N geomagnetic latitude. In winter the morning overshoot phenomenon is observed around 06:00
LT (
T
e enhances to ∼4000
K) during low-solar activity and to
T
e
∼
3800
K, during higher solar activity. In summer, it is observed around 05:30
LT, but the rate of
T
e enhancement is higher during moderate solar activity (∼2700
K/hr) than the low-solar activity (∼1700
K/hr). During equinox, this phenomenon is delayed and is observed around 06:00
LT (∼4200
K) during all three activities.
In winter, the
T
i shows an enhancement (∼2300 from ∼700
K) around 06:00
LT during low-solar activity but during other activities, it raise smoothly with the progress of the morning. In summer,
T
i increases at a rate of 260
K/hr during low and moderate activities and with half the rate (∼130
K/hr) during high-solar activity. And in equinox months, the
T
i is lower during high-solar activity than in low-solar activity. |
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ISSN: | 0273-1177 1879-1948 |
DOI: | 10.1016/j.asr.2008.04.006 |