NDLI: Ionospheric response to X-class solar flares in the ascending half of the subdued solar cycle 24

Content Provider	Springer Nature Link
Author	Hazarika, Rumajyoti Kalita, Bitap Raj Bhuyan, Pradip Kumar
Copyright Year	2016
Abstract	The signature of 11 X-class solar flares that occurred during the ascending half of the present subdued solar cycle 24 from 2009 to 2013 on the ionosphere over the low- and mid-latitude station, Dibrugarh (27.5$^{∘}$N, 95$^{∘}$E; magnetic latitude 17.6$^{∘}$N), are examined. Total electron content (TEC) data derived from Global Positioning System satellite transmissions are used to study the effect of the flares on the ionosphere. A nonlinear significant correlation (R $^{2}$ = 0.86) has been observed between EUV enhancement (ΔEUV) and corresponding enhancement in TEC (ΔTEC). This nonlinearity is triggered by a rapid increase in ΔTEC beyond the threshold value ∼1.5 (×10$^{10}$ ph cm$^{−2}$ s$^{−1}$) in ΔEUV. It is also found that this nonlinear relationship between TEC and EUV flux is driven by a similar nonlinear relationship between flare induced enhancement in X-ray and EUV fluxes. The local time of occurrence of the flares determines the magnitude of enhancement in TEC for flares originating from nearly similar longitudes on the solar disc, and hence proximity to the central meridian alone may not play the dominating role. Further, the X-ray peak flux, when corrected for the earth zenith angle effect, did not improve the correlation between ΔX-ray and ΔTEC.
Starting Page	1235
Ending Page	1244
Page Count	10
File Format	PDF
ISSN	02534126
Journal	Journal of Earth System Science
Volume Number	125
Issue Number	6
e-ISSN	0973774X
Language	English
Publisher	Springer India
Publisher Date	2016-08-26
Publisher Institution	Indian Academy of Sciences
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	X-class solar flare EUV TEC. Earth Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	1900/1901

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