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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2011, Vol. 8, No. 1, pp. 319-327

Variation of ionospheric parameters in the Asian region of Russia in the period of tropical cyclones

M.A. Chernigovskaya 1, V.I. Kurkin 1, I.I. Orlov 1, B.M. Shevtsov 2, I.N. Poddelsky 2
1 Institute of Solar-Terrestrial Physics SB RAS, 664033, Irkutsk p/o box 291; Lermontov st., 126a
2 Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, 684034 Kamchatka region, Elizovskiy district, Paratunka, Mirnaya str., 7
The possibility of manifestation of strong meteorological disturbances (tropical cyclones) in variations of ionospheric parameters in the zone far removed from the disturbance source region has been studied on the basis of analysis of short-period temporal variations of ionospheric parameters. In the analysis performed, we used data on maximum observed frequencies (MOF) of oblique sounding (OS) signals along the Magadan-Irkutsk, Khabarovsk-Irkutsk and Norilsk-Irkutsk paths in East Siberia and the Far East obtained in spring (March-April), summer (July) and autumn (September-October) 2010. The frequency analysis of data on MOF of OS signals has revealed time intervals with enhanced intensity of short-period oscillations which may be interpreted as manifestations of large-scale traveling ionospheric disturbances (TIDs) whose sources were internal gravity waves (IGWs) with periods of 1-5 hours. Based on a complex analysis of helio-geomagnetic, ionospheric, and meteorological data in the regions under study as well as of data on tropical cyclones, we have made an attempt at finding a link between a number of detected TIDs and the ionospheric responses to tropical cyclones which were in their active phase in the north-west Pacific during the periods in question. A considerable increase in the energy of short-period wave disturbances was observed along the OS paths during active tropical cyclogenesis in summer and autumn. The intensity of the observed TIDs decreased as the midpoints of the OS paths moved westward away from the potential IGW sources. Ionospheric responses to wave disturbance propagation from the same IGW sources differ in the OS paths under analysis. The resulting spectra of MOF variations of OS signals for the spring months, when the cyclonic activity in the north-west of the Pacific Ocean was low, in the quiet helio-geomagnetic conditions can be regarded as «background». A comparison of the 'background' spectra with the amplitudes of the perturbations obtained in the periods of active tropical cyclogenesis in the summer and autumn was performed.
Keywords: upper and middle atmosphere, ionosphere, coupling of the atmospheric layers, wave disturbances, tropical cyclones
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