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Observing the Sun at 20–650 MHz at Thermopylae with Artemis |
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| Authors: | A Kontogeorgos P Tsitsipis X Moussas G Preka-Papadema A Hillaris C Caroubalos C Alissandrakis J-L Bougeret G Dumas |
| Institution: | (1) Department of Electronics, Technological Educational Institute of Lamia, Lamia, 35100, Greece;(2) Department of Physics, University of Athens, Athens, 15783, Greece;(3) Department of Informatics, University of Athens, Athens, 15783, Greece;(4) Department of Physics, University of Ioannina, Ioannina, 45110, Greece;(5) LESIA, Observatoire de Paris, Observatoire de Paris-Meudon, Meudon Cedex, 92195, France |
| Abstract: | Fine structure of type IV radio solar bursts with a great variety and complexity often give much information in different ways and enable estimation of various coronal characteristics. In this work, we expose our new method for fine structure revealing and separation of two basic kinds of type IV fine structure, as fibers and pulsations. We also estimate frequency drift of fibers from dynamic spectra, clean from continuous background, with a prototype method using 2-D Fourier transform and we estimate periodicities of fibers as well as pulsations with continuous wavelet transform. Working with the last method we found periodicities close to 3 min umbral oscillations and 5 min global solar oscillations. |
| Keywords: | special issue WSEF sun solar radio bursts solar flares radio spectrograph fibers pulsations coronal loop oscillations |
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