On conformity of the EEJ based ionospheric model to the fountain effect and resulting improvements |
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| Authors: | Rajat Acharya Bijoy Roy M.R. Sivaraman Ashish Dasgupta |
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| Affiliation: | 1. Space Applications Centre, ISRO, SNAA, Room No. 2420, Ambawadi Vistaar P.O., Ahmedabad, Gujarat 380015, India;2. Institute of Radio Physics and Electronics, 92, A P C Roy Road, Calcutta, West Bengal 700009, India;1. Department of Physics, University of Ilorin, Ilorin, Nigeria;2. Department of Physics, College of Science and Engineering, Landmark University, Omu-Aran, Kwara State, Nigeria;3. Lowell Digisonde International, LLC, 175 Cabot Street, Suite 200, Lowell, MA 01854, USA;1. Space Weather Monitoring Center (SWMC), Faculty of Science, Helwan University, Egypt;2. LPP/Polytechnique/UPMC, CNRS, 4 Avenue de Neptune, 94107 Saint-Maur des fossés, France;3. ICTP, Trieste, Italy;4. Lab-STICC UMR 6285 Mines-Télécom Télécom Bretagne, CS 83818, 29288 Brest, Cedex 3, France;1. Institute of Information and Communication Technology, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 25a, Sofia 1113, Bulgaria;2. Haystack Observatory, Massachusetts Institute of Technology, Westford, 01886 MA, USA;3. Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 3, Sofia 1113, Bulgaria |
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| Abstract: | The total electron content (TEC) of the equatorial ionosphere is controlled by photochemical processes as well as the transport of the ionospheric plasma near the magnetic equator. The transport phenomenon is initiated by the vertical drift driven by the eastward electric field, which also drives the Equatorial Electrojet. The empirical relation between the Equatorial Electrojet and the anomaly component of the equatorial TEC has already been established. Taking this relation as a reference, a simplified physical model of the anomaly component of equatorial TEC is obtained as a function of Equatorial Electrojet. Influence of other factors like the solar incidence angle and the solar flux are also considered here and the extent of their influence are also investigated. This has been done using TEC data obtained from dual frequency GPS receivers during the low solar activity period of 2005. The derived model is based on the physics of the underlying fountain effect and matches with the observed empirical relation to a fair extent. Obtained results are found to corroborate with previous findings and these physical model values are found to have improved correlation with the observed data than the reference empirical relation. This establishes the conformity between the EEJ based ionospheric model and the physical phenomenon of the fountain effect. |
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