Diurnal, seasonal and latitudinal variation of ion concentrations as obtained from the SROSS C2 satellite over Indian low and equatorial latitudes during solar minimum

Bhuyan, P. K.; Borgohain, Arup

doi:10.1016/j.asr.2005.12.008

Cited by 5 publications

(3 citation statements)

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“…Bhuyan et al (2002) compared the results with the density measurements made by the Indian SROSS-C2 satellite. Bhuyan and Borgohain (2005) studied diurnal, seasonal and latitudinal variation of ion concentrations as obtained from the SROSS-C2 satellite over Indian low and equatorial latitudes during solar minima. Borgohain and Bhuyan (2010) used the SROSS-C2 and the Taiwanese satellite FORMOSAT-1 over the Indian region to discuss solar cycle variations of ion densities over Indian low and equatorial latitudes.…”

Section: Introductionmentioning

confidence: 99%

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite

et al. 2014

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RESUMENSe analiza la densidad del ion O + medida por el satélite SROSS-C2 durante el mínimo solar de 1995 (F 10.7 = 77) y el máximo solar de 2000 (F 10.7 = 181) para estudiar variaciones diurnas, estacionales, latitudinales y geomagnéticas. El área de estudio abarca una región comprendida entre los 5 y 35º de latitud norte, y los 65 y 95º de longitud oeste sobre la India a una altura de ~500 km (región F2). El año 2000 muestra un aumento significativo en cuanto al promedio anual de densidad del ion O + y un aumento secundario posterior a la puesta del sol en comparación con 1995. Durante el día la ionización alcanza un máximo atribuido a la fotoionización. Sin embargo, la ocurrencia de un máximo posterior a la puesta del sol se atribuye a un fuerte aumento previo a la reversión en la desviación vertical E × B. El efecto geomagnético de la actividad Kp a través del movimiento dinámico de la derivación E × B en los estudios de distribución de densidad del ion O + indica periodicidades de siete y nueve días en 1995 y 2000, respectivamente, así como dependencia polinómica de la densidad del ion O + en la actividad geomagnética Kp. Más aún, la estratificación de la densidad del ion O + de acuerdo con la latitud (5-35º N) indica alta densidad en latitudes medias (12-24º N) en comparación con laltitudes bajas y altas, excepto en el invierno de 1995, que muestra un tendencia diferente (i.e., la densidad decrece conforme se incrementa la latitud). ABSTRACTThe O + ion density measured by the SROSS-C2 satellite during solar minima (year 1995, F 10.7 = 77) and maxima (year 2000, F 10.7 = 181) has been analyzed for studying diurnal, seasonal, latitudinal and geomagnetic variations. The study region covers an area encompassed between 5-35º N latitude and 65-95º E longitude over India at a ~500 km altitude (F2 region). The year 2000 shows significant enhancement in the annual average of O + ion density and attainment of post sunset secondary enhancement compared to 1995. Attributed to photoionization, daytime shows a maximum ionization compared to nigttime. However, attainment of post sunset secondary maxima is attributed to the strong pre-reversal enhancement in the vertical E × B drift. The effect of geomagnetic activity Kp through the E × B drift dynamic movement on O + ion density distribution studies

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Section: Introductionmentioning

confidence: 99%

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite

et al. 2014

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“…In fact ionospheric ion density does not necessarily possess a linear relationship with solar activity (F 10.7 ) and this phenomenon is propounded by Balan et al (1994) also, who conclude that ionosphere variations respond nonlinearly to F 10.7 but linearly to solar EUV flux, especially during solar maximum. Different ions show different trends of variations with solar activity (Bhuyan and Borgohain, 2005). Truhlík et al (2005) reported the manifestation of solar activity in the global topside ion composition of solar maxima and minima, of different solar cycles, using the data of many satellite missions.…”

Section: Introductionmentioning

confidence: 99%

Diurnal and seasonal variation of topside ionospheric ion density over Indian region at solar minimum and solar maximum

Mangla

Sharma

Rajput

2014

Advances in Space Research

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“…For example, data from the Defense Meteorological Satellite Program F10 during 1991–1994 show a larger He + density in the summer hemisphere than in the winter hemisphere at an altitude of 800 km [ West et al , ]. Bhuyan and Borgohain [] reported a higher He + concentration in the June solstice than in the December solstice at all latitude ranges in ±10° during the evening in the Indian longitudinal sector, using data from the Stretched Rohini Satellite Series (SROSS‐C2).…”

Section: Introductionmentioning

confidence: 99%

Global distribution of the He⁺ column density observed by Extreme Ultra Violet Imager on the International Space Station

et al. 2017

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The global distribution of He+ in the topside ionosphere was investigated using data of the He+ resonant scattering emission at 30.4 nm obtained by the Extreme Ultra Violet Imager (EUVI) onboard the International Space Station. The optical observation by EUVI from the low‐Earth orbit provides He+ column density data above the altitude of 400 km, presenting a unique opportunity to study the He+ distribution with a different perspective from that of past studies using data from in situ measurements. We analyzed data taken in 2013 and elucidated, for the first time, the seasonal, longitudinal, and latitudinal variations of the He+ column density in the dusk sector. It was found that the He+ column density in the winter hemisphere was about twice that in the summer hemisphere. In the December solstice season, the magnitude of this hemispheric asymmetry was large (small) in the longitudinal sector where the geomagnetic declination is eastward (westward). In the June solstice season, this relationship between the He+ distribution and the geomagnetic declination is reversed. In the equinox seasons, the He+ column densities in the two hemispheres are comparable at most longitudes. The seasonal and longitudinal dependence of the hemispheric asymmetry of the He+ distribution was attributed to the geomagnetic meridional neutral wind in the F region ionosphere. The neutral wind effect on the He+ distribution was examined with an empirical neutral wind model, and it was confirmed that the transport of ions in the topside ionosphere is predominantly affected by the F region neutral wind and the geomagnetic configuration.

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Diurnal, seasonal and latitudinal variation of ion concentrations as obtained from the SROSS C2 satellite over Indian low and equatorial latitudes during solar minimum

Cited by 5 publications

References 20 publications

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite

Diurnal and seasonal variation of topside ionospheric ion density over Indian region at solar minimum and solar maximum

Global distribution of the He⁺ column density observed by Extreme Ultra Violet Imager on the International Space Station

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Diurnal, seasonal and latitudinal variation of ion concentrations as obtained from the SROSS C2 satellite over Indian low and equatorial latitudes during solar minimum

Cited by 5 publications

References 20 publications

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite

Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite

Diurnal and seasonal variation of topside ionospheric ion density over Indian region at solar minimum and solar maximum

Global distribution of the He+ column density observed by Extreme Ultra Violet Imager on the International Space Station

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Global distribution of the He⁺ column density observed by Extreme Ultra Violet Imager on the International Space Station