Quasi-periodic variations in solar radio emission at 3.3 cm

Durasova, M. S.; Lavrinov, G. A.; Chandaev, A. K.; Yudin, O. I.

doi:10.1007/bf01032961

Cited by 1 publication

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“…Quasi-periodic oscillations of the integral solar radio flux at 3.3 cm, with characteristic periods of about 700 s (and also 250 s), were discovered three decades ago at the Zimenki Radioastronomical Station of NIRFI, Russia, by the group of M.M. Kobrin (Yudin 1968a(Yudin , 1968bDurasova et al 1968). Periodic fluctuations of the solar radio flux were detected during both the growing phase of the solar activity and its minimum.…”

Section: Introductionmentioning

confidence: 99%

Long-Period Oscillations of Sunspots by NoRH and SSRT Observations

Bakunina

Abramov-Maximov

Nakariakov

et al. 2013

Publications of the Astronomical Society of Japan

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Long-term oscillations of microwave emission generated in sunspot magnetospheres are detected with the Nobeyama Radioheliograph (NoRH) at a frequency of 17 GHz, and the Siberian Solar Radio Telescope (SSRT) at 5.7 GHz. Significant periodicities in the range of 22-170 min are found in the variation of the emission intensity, polarisation and the degree of circular polarisation. Periods of the oscillations are not stable: they are different in different sunspots and in the same sunspot on different days. A cross-correlation analysis shows the presence of common significant periods in both NoRH and SSRT data. The cross-correlation coefficients are typically lower than 0.5, which can be attributed to the different heights of the emission formation, and different mechanisms for the emission generation (gyroresonance and thermal bremstrahlung at 17 GHz, and pure gyroresonance at 5.7 GHz). The observational results are consistent with the global sunspot oscillation model.

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Section: Introductionmentioning

confidence: 99%