Low-latitude ionospheric-thermospheric response to storm time electrodynamical coupling between high and low latitudes

Bagiya, Mala S.; Iyer, K. N.; Joshi, H. P.; Thampi, Smitha V.; Tsugawa, Takuya; Ravindran, Sudha; Sridharan, R.; Pathan, B. M.

doi:10.1029/2010ja015845

Cited by 57 publications

(74 citation statements)

References 77 publications

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“…The changes in the electron density distribution and the total electron content (TEC) have been studied using different techniques such as the Faraday rotation measurements (Tyagi et al, 1980;DasGupta et al, 1981), ionosonde networks (Venkatesh et al, 2011), incoherent scatter radars (Zhang et al, 2004), GPS systems (Ramarao et al, 2006) and satellite measurements (Davies and Hartmann, 1997). GPS systems provide data with better accuracy both in time and space and hence are widely used in ground-based studies (Bagiya et al, 2011;Kumar and Singh, 2011;Galav et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ionospheric response to total solar eclipse of 22 July 2009 in different Indian regions

Kumar

Singh

2013

Ann. Geophys.

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The variability of ionospheric response to the total solar eclipse of 22 July 2009 has been studied analyzing the GPS data recorded at the four Indian low-latitude stations Varanasi (100% obscuration), Kanpur (95% obscuration), Hyderabad (84% obscuration) and Bangalore (72% obscuration). The retrieved ionospheric vertical total electron content (VTEC) shows a significant reduction (reflected by all PRNs (satellites) at all stations) with a maximum of 48% at Varanasi (PRN 14), which decreases to 30% at Bangalore (PRN 14). Data from PRN 31 show a maximum of 54% at Kanpur and 26% at Hyderabad. The maximum decrement in VTEC occurs some time (2–15 min) after the maximum obscuration. The reduction in VTEC compared to the quiet mean VTEC depends on latitude as well as longitude, which also depends on the location of the satellite with respect to the solar eclipse path. The amount of reduction in VTEC decreases as the present obscuration decreases, which is directly related to the electron production by the photoionization process. The analysis of electron density height profile derived from the COSMIC (Constellation Observing System for Meteorology, Ionosphere & Climate) satellite over the Indian region shows significant reduction from 100 km altitude up to 800 km altitude with a maximum of 48% at 360 km altitude. The oscillatory nature in total electron content data at all stations is observed with different wave periods lying between 40 and 120 min, which are attributed to gravity wave effects generated in the lower atmosphere during the total solar eclipse

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Section: Introductionmentioning

confidence: 99%

Ionospheric response to total solar eclipse of 22 July 2009 in different Indian regions

Kumar

Singh

2013

Ann. Geophys.

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“…Most of the studies in the region are concerned with the major storms of either May 15, 2005(Dashora et al 2009Bagiya et al 2011;Sharma et al 2011c) or August 24, 2005(Sreeja et al 2009Kumar and Singh 2011b;Sharma et al 2011b). Recently Kumar and Singh (2011a) have reported the TEC variations during the moderate geomagnetic storms that occurred in the low solar activity period 2007-2008.…”

Section: Latitudinal Variations Of Tecmentioning

confidence: 97%

Response of low latitude ionosphere to the geomagnetic storm of May 30

Galav

Sharma

Pandey

2011

Astrophys Space Sci

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Response of low latitude ionosphere to the geomagnetic storm of May 30, 2005 in the Indian longitude sector has been investigated by using the GPS data recorded at three stations namely, Udaipur, Hyderabad and Bengaluru. The event is noteworthy due to the fact that the Z component of interplanetary magnetic field (IMF Bz) remained southward for about 10 hours, coincident with the local day time for the Indian longitude sector, along with significantly higher values of AE and ASY-H indices. However, we neither found any evidence for the presence of long lasting storm time electric fields nor could we infer episodes of eastward-westward penetration of electric fields under steady southward IMF Bz and unsteady ring current conditions. On the storm day, the maximum enhancement in the total electron content has been found to be about 60%. The ionosonde observations also showed increased critical frequency (foF 2 ) and the height (h P F 2 ) of the F layer. The foF 2 was enhanced by ∼60% which is consistent with the enhancement in total electron content. The slow rise and long duration enhancement of h P F 2 and foF 2 have been attributed to the upwelling by the meridional neutral winds, caused by continuous energy inputs at higher latitudes. The poleward expansion of the equatorial ionization anomaly has also been observed on May 30. On May 31, the following day of the storm, significantly suppressed anomaly with near absence of its northern crest in the Indian longitude sector, revealed the effect of storm induced disturbance dynamo electric fields.

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“…There have been several case studies describing the storm time effects in equatorial ionosphere at a particular longitude sector (Basu et al 2001a, b;Sastri et al 2002;Abdu et al 2003;Maruyama 2006) or at more than one longitude sectors (Abdu et al 2007;Tulasi Ram et al 2008;Bagia et al 2011;Rastogi et al 2014a).Most of such studies are based on sudden turnings of IMF-Bz. However, there are space weather events with large or no increase in solar wind velocity, large or no increase in the solar wind proton density or large changes in both solar wind velocity and proton density.…”

Section: Introductionmentioning

confidence: 95%

Equatorial electrojet in the Indian region during the geomagnetic storm of 13–14 November 1998

et al. 2016

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Low-latitude ionospheric-thermospheric response to storm time electrodynamical coupling between high and low latitudes

Cited by 57 publications

References 77 publications

Ionospheric response to total solar eclipse of 22 July 2009 in different Indian regions

Ionospheric response to total solar eclipse of 22 July 2009 in different Indian regions

Response of low latitude ionosphere to the geomagnetic storm of May 30

Equatorial electrojet in the Indian region during the geomagnetic storm of 13–14 November 1998

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