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Maurya, Ajeet K.
- First Observations of Transient Luminous Events In Indian Sub-Continent
Abstract Views :260 |
PDF Views:102
Authors
Rajesh Singh
1,
Ajeet K. Maurya
1,
B. Veenadhari
2,
Sneha A. Gokani
2,
R. Selvakumaran
2,
Morris B. Cohen
3,
Olivier Chanrion
3,
Torsten Neubert
3
Affiliations
1 KSK Geomagnetic Research Laboratory, IIG, Chamanganj, Allahabad 221 505, IN
2 Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, IN
3 School of Electrical and Computer Engineering, Georgia Institute of Technology, IN
1 KSK Geomagnetic Research Laboratory, IIG, Chamanganj, Allahabad 221 505, IN
2 Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, IN
3 School of Electrical and Computer Engineering, Georgia Institute of Technology, IN
Source
Current Science, Vol 107, No 7 (2014), Pagination: 1107-1108Abstract
No Abstract.- Electrical Signature of the October 2013 Very Severe Cyclonic Storm Phailin
Abstract Views :271 |
PDF Views:90
Authors
Affiliations
1 Dr K. S. Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Allahabad 221 505, IN
2 Department of Physics, Doon University, Dehradun 248 001, IN
1 Dr K. S. Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Allahabad 221 505, IN
2 Department of Physics, Doon University, Dehradun 248 001, IN
Source
Current Science, Vol 118, No 3 (2020), Pagination: 421-427Abstract
In this study we examine first of its kind from Indian sub-continent which concentrates the electrical signatures of lightning discharges associated with a very severe cyclonic storm (VSCS). Phailin cyclone during 8–14 October 2013 has been selected for the study. We have primarily used ground-based GLD360 network lightning data to understand the distribution, polarity and radiated peak current of lightning discharge associated with the inner core (~100 km radius) of Phailin. In the initial development stage of Phailin as a deep depression on 8–9 October, there were very few lightning discharged (>50) in the inner core, but when Phailin developed into a VSCS on 10 October, ~2300 lightning discharges were recorded in inner core. There was near-even distribution of positive cloud to ground and negative cloud to ground discharges in the core, and with strong opposite peak currents of ±150 kA prior to the cyclone landfall. The observations show that monitoring of lightning discharges in eye of the cyclone is helpful in tracking its intensity changes and hence can serve as early warning systems.Keywords
Electrical Signature, Lightning Discharges, Peak Current, Tropical Cyclone.References
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- Extreme space weather events of solar cycle 24: X-class solar flares and their impact on the low-latitude D-region ionosphere
Abstract Views :145 |
PDF Views:73
Authors
Affiliations
1 KSK Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Prayagraj 211 506, India., IN
2 Department of Physics, Babasaheb Bhimrao Ambedkar University, Lucknow 226 025, India., IN
3 K. Banerjee Centre of Atmospheric and Ocean Studies, University of Allahabad, Prayagraj 221 002, India., IN
1 KSK Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Prayagraj 211 506, India., IN
2 Department of Physics, Babasaheb Bhimrao Ambedkar University, Lucknow 226 025, India., IN
3 K. Banerjee Centre of Atmospheric and Ocean Studies, University of Allahabad, Prayagraj 221 002, India., IN
Source
Current Science, Vol 124, No 7 (2023), Pagination: 812-819Abstract
X-class solar flares, which occurred in the daytime from 2008 to 2016 during solar cycle 24, were studied for their influence on the lower ionosphere over the low-equatorial Indian region. To understand the D-region behaviour during flare events, we used the very low frequency (VLF) navigational transmitter NWC (19.8 kHz) signal recorded at Pryagraj, Uttar Pradesh, India. A total of seven parameters were estimated: (i) the magnitude of X-ray flux, (ii) VLF signal rising amplitude perturbation (SRAP), (iii) X-ray flux and NWC signal start time difference (STD), (iv) peak time difference (PTD), (v) Wait’s ionospheric parameters h′ (reference height), (vi) β (sharpness factor) and (vii) D-region electron density difference (EDD) to determine the overall effect of solar flares on the D-region. The results suggest that three parameters (X-ray flux, SRAP and h′) show a decreasing trend through the linear fit line, two parameters (β and EDD) show an increasing trend, while the remaining two parameters show a mixed trend (decrease during low activity and increase during high activity). Further, the trend line during the diurnal variation shows an increasing trend for X-ray flux, PTD and h′, and a decreasing trend for SRAP, STD, β and EDD. Deviation in the case of individual events may indicate the dependence of these parameters on the seasons as well. The present study will provide the base for more robust analysis and modelling work in the future to understand the complexity of ionospheric change during flare events, and to develop a predictive model for space weather mitigation.Keywords
D-Region Ionosphere, Space Weather, Solar Cycle, Solar Flares, Trend Line, Vlf Waves.References
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