Variation of ionospheric electron and ion temperatures during periods of minimum to maximum solar activity by the SROSS-C2 satellite over Indian low and equatorial latitudes

Sharma, Pooja; Pathak, Pushparaj Mani; Sharma, Dinesh K.; Rai, Jagdish

doi:10.1016/j.asr.2009.08.001

Cited by 11 publications

(5 citation statements)

References 37 publications

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“…Evans (1973), Mahajan and Pandey (1979), Bilitza and Hoegy (1990), Truhlik et al (2001), Webb and Essex (2003), and Sharma et al (2010) but so far no model describes this feature accurately and it is therefore not yet included in the IRI model. The elementary mechanisms that play an important role in the T e variation with solar flux seem to be broadly understood.…”

Section: Introductionmentioning

confidence: 99%

A new global empirical model of the electron temperature with the inclusion of the solar activity variations for IRI

2012

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A data-base of electron temperature (T e ) comprising of most of the available LEO satellite measurements in the altitude range from 350 to 2000 km has been used for the development of a new global empirical model of T e for the International Reference Ionosphere (IRI). For the first time this will include variations with solar activity. Variations at five fixed altitude ranges centered at 350, 550, 850, 1400, and 2000 km and three seasons (summer, winter, and equinox) were represented by a system of associated Legendre polynomials (up to the 8th order) in terms of magnetic local time and the earlier introduced invdip latitude. The solar activity variations of T e are represented by a correction term of the T e global pattern and it has been derived from the empirical latitudinal profiles of T e for day and night (Truhlik et al., 2009a). Comparisons of the new T e model with data and with the IRI 2007 T e model show that the new model agrees well with the data generally within standard deviation limits and that the model performs better than the current IRI T e model.

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Section: Introductionmentioning

confidence: 99%

A new global empirical model of the electron temperature with the inclusion of the solar activity variations for IRI

2012

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“…The diurnal features observed by ROCSAT-1 measurements for Ti during years1999-2003 shows that Ti presents a minimum value during pre-sunrise hours and as the sun progresses, the Ti exhibits a sharp increment known as the morning overshoot [Aggarwal et al 2007, Sharma et al 2010.Owing to photoionization, photoelectrons gain higher energy which they share with the surrounding electrons and ions through coulomb-collision; consequently, because of lesser electron/ion density in early morning hours, ion temperature starts increasing rapidly and attains a maximum/peak value at ~07:00 LT [Balan et al, 1996;Su et al, 1995;Bardhan et al, 2015;Oyama et al, 1996]. After attainment the morning peak, Ti experiences a daytime trough, and then, due to the pre-reversal enhancement phenomenon [Balan et al, 1997], it shows an evening enhancement followed by a nighttime decrease.…”

Section: Annual -Diurnal Variation Of Ion Tem-perature Timentioning

confidence: 99%

Variations of ion density and temperature as measured by ROCSAT-1satellite and comparison with IRI-2016 model over low latitude region

Rana

Bardhan²,

Sharma³

et al. 2019

Annals of Geophysics

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The solar radiations are the primary cause of ionization of the Earth's atmosphere. Specifically, the X-ray and extreme ultraviolet radiations are the basic drivers at the base of the plasma density distribution in the ionosphere. It is well known that ionospheric plasma and temperature varies with respect to the latitude, altitude, season, geomagnetic and solar activities [Fejer 1997, and Otsuka et al.1998]. The morphology and dynamics of equatorial and low latitude regions is different compared to the mid and high latitude ones.This is because in the low latitude and equatorial regions there occur some unique phenomenon such as equatorial ionization anomaly (EIA), equatorial electrojet (EEJ), plasma fountain, equatorial spread-F (ESF), equatorial wind and temperature [Bhuyan et al., 2002; Prabhakaran Nayar et al., 2004].The EIA is an important characteristic of low latitude ionosphere, which is basically a trough in plasma density at magnetic equator Article history

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“…The bulk plasma is expected to have a maximum speed of a few km s −1 . Typical ionospheric electron temperatures are 1000-4000 K [11,12], which equates to thermal speeds of roughly 175-350 km s −1 . This is sufficient to treat the electrons as non-drifting.…”

Section: Regarding Assumptions About the Plasmamentioning

confidence: 99%

A new Langmuir probe concept for rapid sampling of space plasma electron density

Jacobsen

Pedersen

Moen

et al. 2010

Meas. Sci. Technol.

113

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In this paper we describe a new Langmuir probe concept that was invented for the in situ investigation of HF radar backscatter irregularities, with the capability to measure absolute electron density at a resolution sufficient to resolve the finest conceivable structure in an ionospheric plasma. The instrument consists of two or more fixed-bias cylindrical Langmuir probes whose radius is small compared to the Debye length. With this configuration, it is possible to acquire absolute electron density measurements independent of electron temperature and rocket/satellite potential. The system was flown on the ICI-2 sounding rocket to investigate the plasma irregularities which cause HF backscatter. It had a sampling rate of more than 5 kHz and successfully measured structures down to the scale of one electron gyro radius. The system can easily be adapted for any ionospheric rocket or satellite, and provides high-quality measurements of electron density at any desired resolution.

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Variation of ionospheric electron and ion temperatures during periods of minimum to maximum solar activity by the SROSS-C2 satellite over Indian low and equatorial latitudes

Cited by 11 publications

References 37 publications

A new global empirical model of the electron temperature with the inclusion of the solar activity variations for IRI

A new global empirical model of the electron temperature with the inclusion of the solar activity variations for IRI

Variations of ion density and temperature as measured by ROCSAT-1satellite and comparison with IRI-2016 model over low latitude region

A new Langmuir probe concept for rapid sampling of space plasma electron density

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