Ionospheric and geomagnetic Pc5 oscillations as observed by the ionosonde and magnetometer at Sodankyläстатья

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Дата последнего поиска статьи во внешних источниках: 20 мая 2019 г.

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1. Kozyreva_ASR19_ionosonde.pdf Kozyreva_ASR19_ionosonde.pdf 5,6 МБ 5 марта 2019 [Pilipenko]

[1] Ionospheric and geomagnetic pc5 oscillations as observed by the ionosonde and magnetometer at sodankylä / O. Kozyreva, A. Kozlovsky, V. Pilipenko, N. Yagova // Advances in Space Research. — 2019. — Vol. 63. — P. 2052–2065. The study is based on the data of the rapid-run ionosonde at the Sodankylä Geophysical Observatory at auroral latitude (L = 5.25) which routinely performs one-minute sounding since 2007. This dataset allows a unique opportunity for investigating possible effects of ultra-low frequency (ULF, 1-7 mHz) waves in the auroral ionosphere. Suitable observations were made during moderately disturbed geomagnetic conditions typically at recovery of the geomagnetic storms caused by solar wind high-speed streams, in the daytime between 9 and 16 MLT. The ionospheric oscillations corresponding to Pc5 geomagnetic pulsations were found in variations of the virtual height of the F layer and the power of ionosonde reflections from E and F layers. The later are most probably caused by modulation of electron precipitation, which is also manifested in weak (about 0.01 – 0.06 dB) variations of cosmic noise absorption. The most important and novel result is that the pulsations of power of reflection from E and F layers typically has a spectral maximum at nearly half the periodicity of the Pc5 geomagnetic pulsations, whereas such spectral peak is negligible in the geomagnetic pulsations. [ DOI ]

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