Influence of a tropical cyclone on the upper ionosphere according to tomography sounding data over Sakhalin Island in November 2007

Computer Science – Sound

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Scientific paper

Tomography sounding data for the first half of November 2007 are presented. The sounding was conducted over three points located at the same meridian—Yuzhno-Sakhalinsk (47° N, 143° E), Poronaisk (49° N, 143° E), and Nogliki (51° N, 143° E)—in order to find the possible influence of a tropical cyclone on the upper ionosphere. A change in the foF2 parameter by on average no more than 10-20% is a possible response of the upper ionosphere localized over the tropical cyclone (TC) zone (in the given case, 25°-30° northward and 5°-20° eastward) at a distance of approximately 3800-5500 km from it. A decrease or, vice versa, an increase in foF2 is related to the delay of the measurement moment relative to the beginning of the TC action. The complexity of a morphological analysis of the given event is that a tropical cyclone is a "wideband" (in the longitudinal and, to a lesser degree, in the latitudinal directions) and lasting disturbance source.

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