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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. 4, pp. 107-116

Seasonal and latitudinal variations of parameters of MHD-nature wave packets, generated by solar terminator

I.K. Edemskiy , S.V. Voeykov , Yu.V. Yasyukevich 
Institute of solar-terrestrial physics SB RAS, 664033, Russia, Irkutsk, Lermontov st., 126а, p.o. box 291
This paper presents seasonal registration features of wave packets (WP), generated by solar terminator (ST). Results achieved using data of most dense GPS-site networks, located in Japan and USA. Total number of sites for the both networks is about 1220 sites. Registered WPs quantity in Japan is higher in total that in USA: in winter in Japan are registered in two times more WPs than in USA. For other seasons number of registered in Japan WPs is higher about 5-6 times then in USA. Seasonal variation of WPs registration start is in agreement with magnetohydrodynamic (MHD) hypothesis of WP nature, which was suggested before. Important evidence of this hypothesis is observed variation of WP registration time with latitude. In the North region of Japan (38о-45оN) time period between WP registration start ant the ST appearance over the observation point is longer than in South region (30о-35оN). That fact is in correspondence with time period between ST appearance in magnetoconjugate and in observation points for those regions. Dynamic spectra of total electron content variations demonstrate two areas of spectral power growth. That is indication of WP generation by different local sources.
Keywords: solar terminator, wave disturbances, ionosphere, GPS, total electron content, MHD
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