Efimov A.I., Lukanina L.A., Samoznaev L.N., Chashei I.V., Bird M.K., Pätzold M. Frequency fluctuations in the solar corona investigated with radio sounding experiments on the spacecraft ROSETTA and MARS EXPRESS in 2010/2011. Advance in Space Research , 2017 , 59. С. 1652-1662.
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Coronal radio-sounding experiments were carried out using two-way coherent dual-frequency carrier signals of the ESA spacecraft ROSETTA in 2010 and MARS EXPRESS in 2010/2011. Differential frequency measurements recorded at both NASA and ESA tracking stations (sample rate: 1 Hz) are analyzed in this paper. Spectral analysis of the S-band, X-band, and differential frequency records has shown that the r.m.s. frequency fluctuation of each signal can be described by a radial power-law function of the form σi = Ai(R/Rs)^(-βi), where i = s, x, sx. The ratio of the coefficients As and Ax differs from the expected theoretical value As/Ax = fs/fx. This occurs because the X-band fluctuations underlie two-way propagation conditions while the S-band fluctuations are essentially the product of a one-way propagation experiment. The intensity of the frequency fluctuations decreases sharply at high heliolatitudes. The asymmetry of the frequency fluctuation intensity between ingress and egress is exploited to determine the solar wind speed at small heliocentric distances.
| Тип объекта: | Статья |
|---|---|
| Авторы на русском. ОБЯЗАТЕЛЬНО ДЛЯ АНГЛОЯЗЫЧНЫХ ПУБЛИКАЦИЙ!: | Ефимов А.И., Луканина Л.А., Самознаев Л.Н., Чашей И.В., Бёрд М.К., Петцольд М. |
| Подразделения (можно выбрать несколько, удерживая Ctrl): | 114 лаб. исследований космической плазмы радиофизическими методами |
| URI: | http://cplire.ru:8080/id/eprint/3071 |
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