Latitudinal features of Total Electron Content over the African and European longitude sector following the St. Patrick’s day storm of 2015

Paul, Ashik; Kascheyev, A.; Rodríguez-Bouza, M.; Pathak, Kamlesh; Ferreira, Arthur Amaral; Shetti, Dadaso J.; Yao, Jian

doi:10.1016/j.asr.2017.09.012

Cited by 4 publications

(1 citation statement)

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“…(Ray et al, 2017) have reported observations of amplitude, phase scintillations and TEC from different GPS stations of India during the storm of 17 March, 2015 and highlighted its effects on the performance of GPS. A very interesting observation of severely depleted ionosphere on the day following the St. Patrick day storm of 2015 at high latitudes (north of 65°N) was reported by (Paul et al, 2018) using GPS TEC measurements over a network of stations extending from the equator to the polar regions along the African and European longitude sector. The Indian subcontinent covers the low latitude zone in the South-Asian longitudes where the magnetic equator passes over the southern tip of the peninsula near Trivandrum (DasGupta et al, 2007).…”

Section: Introductionmentioning

confidence: 92%

Effects of CME and CIR induced geomagnetic storms on low-latitude ionization over Indian longitudes in terms of neutral dynamics

Chakraborty

Ray

Datta

et al. 2020

Advances in Space Research

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This paper presents the response of the ionosphere during the intense geomagnetic storms of October 12-20, 2016 and May 26-31, 2017 which occurred during the declining phase of the solar cycle 24. Total Electron Content (TEC) from GPS measured at Indore, Calcutta and Siliguri having geomagnetic dips varying from 32.23°N, 32°N and 39.49°N respectively and at the International GNSS Service (IGS) stations at Lucknow (beyond anomaly crest), Hyderabad (between geomagnetic equator and northern crest of EIA) and Bangalore (near magnetic equator) in the Indian longitude zone have been used for the storms. Prominent peaks in diurnal maximum in excess of 20-45 TECU over the quiet time values were observed during the October 2016 storm at Lucknow, Indore, Hyderabad, Bangalore and 10-20 TECU for the May 2017 storm at Siliguri, Indore, Calcutta and Hyderabad. The GUVI images onboard TIMED spacecraft that measures the thermospheric O/N 2 ratio, showed high values (O/N 2 ratio of about 0.7) on October 16 when positive storm effects were observed compared to the other days during the storm period. The observed features have been explained in terms of the O/N 2 ratio increase in the equatorial thermosphere, CIR-induced High Speed Solar Wind (HSSW) event for the October 2016 storm. The TEC enhancement has also been explained in terms of the Auroral Electrojet (AE), neutral wind values obtained from the Horizontal Wind Model (HWM14) and equatorial electrojet strength from magnetometer data for both October 2016 and May 2017 storms. These results are one of the first to be reported from the Indian longitude sector on influence of CMEand CIR-driven geomagnetic storms on TEC during the declining phase of solar cycle 24.

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Section: Introductionmentioning

confidence: 92%