Vol. 22, issue 09, article # 10

Abstract:

This paper presents the results of investigation of mid-latitude upper atmosphere response to tropical cyclones, which were observed over the Northwest Pacific Ocean in September–October 2005. It is accepted that internal atmospheric waves (IAWs) are among the physical mechanisms of the interaction between the troposphere and ionosphere. It is also assumed that IAWs travel upward along oblique trajectories and manifest themselves in the upper atmosphere as traveling ionospheric disturbances (TIDs). Such TIDs can be registered at distances of some thousands of kilometers from the IAWs tropospheric source. To check up this hypothesis, we carried out statistical and harmonic analyses of data on the vertical sounding of the upper atmosphere in the East Siberian and Far Eastern regions of Russia, in the China, and the Australia. The disturbances, which most probably can be associated with cyclones, were pick out from variations of ionospheric F-region parameters: the increase of oscillation amplitude in the range of periods 1.5–6 h; essential deviation of F-region parameters from their medians.

Keywords:

vertical sensing of ionosphere; critical frequency; cyclonic activity