Catalogo Articoli (Spogli Riviste)


Ionospheric reconstruction using Faraday rotation data: A new technique
Ganguly, S; Brown, A; DasGupta, A; Ray, S;
Ctr Remote Sensing Inc, Fairfax, VA 22030 USA Ctr Remote Sensing Inc Fairfax VA USA 22030 ng Inc, Fairfax, VA 22030 USA Univ Calcutta, Inst Radio Phys & Elect, Calcutta 700009, W Bengal, India Univ Calcutta Calcutta W Bengal India 700009 utta 700009, W Bengal, India
Titolo Testata:
fascicolo: 4, volume: 36, anno: 2001,
pagine: 789 - 800
Tipo documento:
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Indirizzi per estratti:
Indirizzo: Ganguly, S Ctr Remote Sensing Inc, 11350 Random Hills Rd,Suite 710, Fairfax, VA 22030USA Ctr Remote Sensing Inc 11350 Random Hills Rd,Suite 710 Fairfax VA USA 22030
S. Ganguly et al., "Ionospheric reconstruction using Faraday rotation data: A new technique", RADIO SCI, 36(4), 2001, pp. 789-800


Measurements of total electron content of the ionosphere by recording group delay or differential phase of transionospheric satellite signals have been used for reconstruction of ionospheric profiles. Integrated electron content measurements contain little information of ionospheric height distribution and require precise observations. These measurements are difficult forVHF and higher frequencies and require reasonably sophisticated instruments. Faraday rotation measurements, on the other hand, require relatively simple instruments and were widely used throughout the world. Faraday rotationof HF, VHF, and lower UHF band signals contains an additional term, e.g., a known function of the magnetic field. The functional form depends on the ray path and orientation of the magnetic field and in general is a complex quantity. Since the magnetic field distribution in the Earth's ionosphere is known with very high precision, this information can be used to obtain improved reconstruction of the ionospheric profiles. The magnetic field components have a strong dependence with the height, and this provides additional information regarding the ionospheric height retrieval. We have performedsimulations using these techniques, and we present results using both simulated data as well as Faraday rotation data measured from several stations. We compare the sensitivities and reconstruction of ionospheric profiles using group delay and Faraday rotation techniques and demonstrate the improvements with the use of Faraday rotation data. The most difficult (in terms of radio propagation) regions, i.e., those near the equatorial regions, are simulated, and data from several stations, i.e., those near Calcutta, India, as well as those from several stations in Africa, are used. For the firsttime, we present the results of the reconstruction of the ionosphere usingboth simulated and observed Faraday rotation data. Large amounts of Faraday rotation data have been acquired during the 1960s and 1970s. These data contain a history of the ionosphere. The present technique would allow retrieval of ionospheric profiles over extended regions and could allow inferences to be drawn regarding the long-term changes in the ionosphere. The technique can also be incorporated in future satellite beacons, and the combination of group delay and Faraday rotation techniques will allow us to obtain superior reconstructions.

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Documento generato il 27/09/20 alle ore 05:06:38