Long-period oscillations of millimeter emission above sunspots

Details Long-period oscillations of millimeter emission above sunspots Long-period oscillations of millimeter emission above sunspots

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...534a.137s&link_type=abstract

Astronomy & Astrophysics, Volume 534, id.A137

Astronomy and Astrophysics

Astrophysics

Sun: Oscillations, Sun: Radio Radiation

Scientific paper

Aims: The investigation of long quasi-periodic oscillations in sunspots/active regions based on millimeter radio data was the main goal of this work. Methods: Data from simultaneous monitoring observations of solar active regions at 37 GHz and 93 GHz at two different ground-based radio telescopes were obtained. We analyzed them with the methods of wavelet (Morlet) and global wavelet spectrum analysis. Results: Two main ranges (10-60 and 80-130 min) of long quasi-periodic oscillations were found. We compared them with 17 GHz Nobeyama Radioheliograph (NoRH) data and obtained the same ranges for the long-period oscillations. The long-period oscillations found in this study are relatively stable and could be interpreted as a radial mode of sunspot oscillations.

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