Study of simultaneous penetration of electric fields and variation of total electron content in the day and night sectors during the geomagnetic storm of 23 May 2002

Galav, Praveen; Sharma, Siddharth; Pandey, R.

doi:10.1029/2011ja017002

Cited by 33 publications

(22 citation statements)

References 49 publications

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“…With the large network of GPS receivers available across the world and its continuous operation, GPS has become an intensive tool for studying ionospheric variability during quiet and disturbed periods (Richmond 1995;Fuller-Rowell et al 1997;Dasgupta et al 2007;Mukherjee et al 2010;Kumar and Singh 2011;Kumar et al 2012). Apart from this, GPS also provides data with better accuracy in time and space and hence is widely used in ground-based ionospheric studies (Rama Rao et al 2006;Bagiya et al 2009;Singh 2009, 2011;Galav et al 2011). The TEC in the low-latitude/EIA region is subject to day-to-day variability and is a challenging problem for ionospheric modelers (Huang et al 1989;Klobuchar 1986).…”

Section: Introductionmentioning

confidence: 99%

Validation of the IRI-2012 model with GPS-based ground observation over a low-latitude Singapore station

et al. 2014

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The ionospheric total electron content (TEC) in the low-latitude Singapore region (geographic latitude 01.37°N, longitude, 103.67°E, geomagnetic latitude 8.5°S) for 2010 to 2011 was retrieved using the data from global positioning system (GPS)-based measurements. The observed TEC from GPS is compared with those derived from the latest International Reference Ionosphere (IRI)-2012 model with three options, IRI-Nequick (IRI-Neq), IRI-2001, and IRI-01-Corr, for topside electron density. The results showed that the IRI-Neq and IRI-01-Corr models are in good agreement with GPS-TEC values at all times, in all seasons, for the year 2010. For the year 2011, these two models showed agreement at all times with GPS-TEC only for the summer season, and for the period 11:00 to 24:00 UT hours (19:00 to 24:00 LT and 00:00 to 08:00 LT) during the winter and equinox seasons. The IRI-2012 model electron density profile showed agreement with constellation observing system for meteorology, ionosphere, and climate (COSMIC) radio occultation (RO)-based measurements around 250 to 300 km and was found to be independent of the options for topside density profiles. However, above 300 km, the IRI-2012 model electron density profile does not show agreement with COSMIC measurements. The observations (COSMIC and GPS) and IRI-2012-based data of TEC and electron density profiles were also analyzed during quiet and storm periods. The analysis showed that the IRI model does not represent the impact of storms, while observations show the impact of storms on the low-latitude ionosphere. This suggests that significant improvements in the IRI model are required for estimating behavior during storms, particularly in low-latitude regions.

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Section: Introductionmentioning

confidence: 99%

Validation of the IRI-2012 model with GPS-based ground observation over a low-latitude Singapore station

et al. 2014

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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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“…[] and Galav et al . [] also reported that the nightside ΔH in Japan can react to the PPEF. More data need to be examined to understand this longitude bias.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Galav et al . [] used HAT (geomagnetic latitude 23.9°N) and GUA (geomagnetic latitude 5.0°N), while Li et al . [] used MUT (geomagnetic latitude 3.6°N) and PHU (geomagnetic latitude 7.1°N) to discern PPEF signatures and acquired reasonable results.…”

Section: Data Sets and Observationsmentioning

confidence: 99%

“…For another example, during an intense storm, the dayside ΔH in Peru and the nightside ΔH in Japan were found to be related to the PPEF (see figure of Galav et al . []). Since the nightside ΔH must have a different origin from the dayside ΔH due to the lack of significant Cowling conductivity on the nightside ionosphere, naturally, such questions as “Can nightside ΔH be an indicator of the PPEF?” and “What is the local time range from which we can use ΔH to identify the PPEF?” arise.…”

Section: Introductionmentioning

confidence: 99%

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Can a nightside geomagnetic Delta H observed at the equator manifest a penetration electric field?

et al. 2013

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[1] A prompt penetration electric field (PPEF) usually manifests itself in the form of an equatorial ionospheric electric field being in correlation with a solar wind electric field. Due to the strong Cowling conductivity, a PPEF on the dayside can be inferred from Delta H (ΔH), which is the difference in the magnitudes of the horizontal (H) component between a magnetometer at the magnetic equator and one off the equator. This paper aims to investigate the performance of ΔH in response to a PPEF on the nightside, where the Cowling conductivity is not significant. We first examine the strongest geomagnetically active time during the 20 November 2003 superstorm when the Dst drops to À473 nT and show that the nightside ΔH can indeed manifest a PPEF but with local time dependence and longitude dependence. We then examine a moderately active time by taking advantage of the multiple-penetration event during 11-16 November 2003 when the Dst remains greater than À60 nT. During this event, a series of PPEF pulses recorded in Peru, Japan, and India form a database, allowing us to examine PPEF effects at different local times and longitudes. The results show that (1) the nightside ΔH was caused by attenuation of the effects of the polar electric field with decreasing latitude; (2) the nightside ΔH can manifest a PPEF at least in the midnight-dawn sector (0000-0500 LT), but not always; and (3) the magnitude of the nightside ΔH in the midnight-dawn sector in Peru is on average only 1/18 of that of the dayside ΔH in response to a given PPEF.

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Study of simultaneous penetration of electric fields and variation of total electron content in the day and night sectors during the geomagnetic storm of 23 May 2002

Cited by 33 publications

References 49 publications

Validation of the IRI-2012 model with GPS-based ground observation over a low-latitude Singapore station

Validation of the IRI-2012 model with GPS-based ground observation over a low-latitude Singapore station

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

Can a nightside geomagnetic Delta H observed at the equator manifest a penetration electric field?

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