New Developments in ARTEMIS IV Solar Radio Spectrograph

International audienceWe present recent developments of the ARTEMIS IV solar radio spectrograph operating at Thermopylae, central Greece. Observations are obtained daily in total intensity and in the frequency range from 20 to 650 MHz, using two antennas and two receivers. We are now in the process of developing a new system that will record consecutively the intensity of right-hand and left-hand polarized waves using one of the antennas and the same receivers

Observing the Sun at 20 650 MHz at Thermopylae with Artemis

International audienceFine 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

Type II and IV radio bursts in the active period October-November 2003

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Fine radio structures during a major solar event observed with ARTEMIS IV

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Detection of slopes of linear and quasi-linear structures in noisy background, using 2D-FFT

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Type II Shocks Characteristics: Comparison with associated CMEs and Flares

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Type III events, flares and CMEs, in the extremely active period October-November 2003

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Periodicities in Fine Structure of Type IV Radio Solar Bursts

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Fine radio structures during a major solar event observed with ARTEMIS IV

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