Affiliation:
1. Dibrugarh university
2. Tinsukia college
3. Tinsukia College, Department of Physics
4. Dibrugarh University, Department of Physics
Abstract
In this paper, we present a quiet day empirical model of electron density (Ne) for the Indian equatorial zone at an altitude of 500 km. The model is applicable to all levels of solar activity and is based on the observation that the electron density in the F-region of the Indian zone is correlated with the F10.7 cm solar flux at each local time and in every month. Using this characteristic, we describe the model for electron density. In this model, we have used the least square fit and the polynomial fit. The electron density measured by the Retarding Potential Analyzer (RPA) on board the SROSS C2 satellite from 1995 to 2000 and FORMOSAT-1 (ROCSAT-1) satellite, operated by the National Space Organization (NSPO, now the Taiwan Space Agency (TASA)) of the Republic of China (Taiwan), from 1999 to 2004 is used to derive the relationship between Ne and F10.7. The average altitudes of SROSS-C2 and FORMOSAT-1 are 500 km and 600 km respectively. Due to this height difference, the observed data obtained by FORMOSAT-1 is normalized to match the SROSS-C2 data. The model is compared with the observations and is found to be in good agreement with them. It is applicable to quiet (Ap<15) conditions and is limited to a fixed altitude of 500 km within the latitude range of 10° S to 10° N around the 75° E meridian.
Publisher
Infra-M Academic Publishing House
Reference23 articles.
1. Balan N., Bailey G.J., Jayachandran B. Ionospheric evidence for a non-linear relationship between the solar EUV and 10.7 cm fluxes during an intense solar cycle. Planet. Space Sci. 1993, vol. 41, pp. 141–145. DOI: 10.1016/0032-0633(93)90043-2., Balan N., Bailey G.J., Jayachandran B. Ionospheric evidence for a non-linear relationship between the solar EUV and 10.7 cm fluxes during an intense solar cycle. Planet. Space Sci. 1993, vol. 41, pp. 141–145. DOI: 10.1016/0032-0633(93)90043-2.
2. Balan N., Bailey G.J., Jenkins B., Rao P.B., Moffett R.J. Variations of ionospheric ionization and related solar fluxes during an intense solar cycle. J. Geophys. Res. 1994, vol. 99, pp. 2243–2253. DOI: 10.1029/93JA02099., Balan N., Bailey G.J., Jenkins B., Rao P.B., Moffett R.J. Variations of ionospheric ionization and related solar fluxes during an intense solar cycle. J. Geophys. Res. 1994, vol. 99, pp. 2243–2253. DOI: 10.1029/93JA02099.
3. Bhuyan P.K., Baruah S. A regional mapping of the foF2 over India as an additional input to IRI. Adv. Space Res. 1996, vol. 18, no. 6, pp. 205–208. DOI: 10.1016/0273-1177(95)00924-8., Bhuyan P.K., Baruah S. A regional mapping of the foF2 over India as an additional input to IRI. Adv. Space Res. 1996, vol. 18, no. 6, pp. 205–208. DOI: 10.1016/0273-1177(95)00924-8.
4. Bhuyan P.K., Chamua M. An empirical model of electron temperature in the Indian topside ionosphere for solar minimum based on SROSS C2 RPA data. Adv. Space Res. 2006, vol. 37, pp. 897–902. DOI: 10.1016/j.asr.2005.09.016., Bhuyan P.K., Chamua M. An empirical model of electron temperature in the Indian topside ionosphere for solar minimum based on SROSS C2 RPA data. Adv. Space Res. 2006, vol. 37, pp. 897–902. DOI: 10.1016/j.asr.2005.09.016.
5. Bhuyan P.K., Tyagi T.R., Singh L., Somayajulu Y.V. Ionospheric electron content measurements at a northern low midlatitude station through half a solar cycle. J. Radio and Space Phys. 1983, vol. 12, pp. 84–93., Bhuyan P.K., Tyagi T.R., Singh L., Somayajulu Y.V. Ionospheric electron content measurements at a northern low midlatitude station through half a solar cycle. J. Radio and Space Phys. 1983, vol. 12, pp. 84–93.