Journal of Earth Science & Climatic Change
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The present paper indicates response of ionosphere over Mumbai due to super-intense geomagnetic storms during 2003 to 2005,
by analysis of dual frequency permanent GPS station at Indian Institute of Technology Bombay, Mumbai, India (Geographic,
19.13256? N, 72.91623? E; Geomagnetic, 10.78? N, 146.70? E). Although storms occur less frequently, but the intense ones may cause
potential threat to sophisticated ground- and space-based technological systems. With the phase and pseudorange observation from
all available GPS satellites, the 2-sigma iterated mean total electron content (TEC) is estimated at every 0.1 hr interval. The maximum
value of mean vertical TEC as estimated from the GPS observables are ~132.4 on 29th October (Disturbance storm index in nano
tesla, Dst = -353 nT) and ~92.9 on 20th November (Dst = -383 nT) in the year 2003. Similarly, the estimated TEC on 7th November
(Dst = -374 nT) and 9th November (Dst = -263 nT) of the year 2004 are overblown to ~63.7 and ~83.3 units respectively. The super
storm during 15th May 2005 (Dst = -247nT) also shows the corresponding value of ~81.6 units. The consequences of TEC variation
is then correlated with 4-minute averages of interplanetary magnetic field and 3-hourly geomagnetic K-indices to analyze the storm
effects and its abnormal variations due to interaction between interplanetary magnetic field and geomagnetic field. The anomalous
behavior of TEC during the occurrence is compared with outcome of previous and successive quiet days to estimate its influence
during positioning measurements.
Mr. Sampad Kumar Panda has completed masters in Physics and Remote Sensing & GIS. Presently he is pursuing PhD. in ionospheric applications
of GPS signals. His research interests include earth-space weather interactions, global navigation satellite system, surveying and geodesy. He is a
life member of Indian Society of Remote Sensing and Indian Society of Geomatics.
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