Simultaneous Observations of the Natural Electromagnetic Emission in the ELF–VLF Range at Kamchatka and in Yakutia during the Solar Eclipse of August 1, 2008

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The effect of the solar eclipse that occurred on August 1, 2008, on the level of the natural electromagnetic emission signals in the ELF–VLF range, simultaneously observed at Kamchatka and in Yakutsk,
and the variations in the amplitude and phase of signals from the ULF radiostations, registered in Yakutsk, has been considered. The ULF radiostations in Krasnodar, Novosibirsk, and Khabarovsk successively emitted
signals at frequencies of 11 905, 12 649, and 14 880 kHz. Based on the observations of the signals from these radiostations, it has been established that the signal amplitudes and phases increased by 3–5% and 30°–45°
when the signals crossed the lunar shadow region. The synchronous registration of the ELF–VLF noise emission indicated that a bay like increase and the following decrease in the emission to the background level was
observed at both receiving points during the eclipse from ~1000 to 1130 UT. This effect was registered at frequencies of 0.6–5.6 kHz in Yakutsk and at lower (30–200 Hz) and higher (2.5–11 kHz) frequencies at Kam
chatka. In this case the noise emission intensity maximum was observed when the lunar shadow maximally approached the registration point. At higher frequencies, the emission maximum was observed simulta
neously at both points (at 1100 UT) but with a delay relative to the maximum at lower frequencies. The possible causes of the appearance of the solar eclipse effects in the natural ELF–VLF emission are considered.
 

Druzhin G. I., Uvarov V. N., Mullayarov V. A., Kozlov V. I., and Korsakov A. A., Simultaneous Observations of the Natural Electromagnetic Emission in the ELF–VLF Range at Kamchatka and in Yakutia during the Solar Eclipse of August 1, 2008 // Geomagnetism and Aeronomy, 2010, Vol. 50, No. 2, pp. 211–218