Subsecond (0.1 s) Pulsations in the 11 April 2001 Radio Event

Radio pulsations observed during the 11 April 2001 event at six single frequencies (237, 327, 408, 610, 1420, and 2695 MHz) by the Trieste radio-polarimeter with a time resolution 10 ms are analyzed. A wavelet analysis method as well as time delay and polarization measurements are used. Both methods...

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Bibliographic Details
Published in:Solar physics 2010-02, Vol.261 (2), p.281-294
Main Authors: Karlický, M., Zlobec, P., Mészárosová, H.
Format: Article
Language:English
Subjects:
Astrophysics
Astrophysics and Astroparticles
Atmospheric Sciences
Physics
Physics and Astronomy
Radiation
Radio astronomy
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Sun
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Summary:Radio pulsations observed during the 11 April 2001 event at six single frequencies (237, 327, 408, 610, 1420, and 2695 MHz) by the Trieste radio-polarimeter with a time resolution 10 ms are analyzed. A wavelet analysis method as well as time delay and polarization measurements are used. Both methods reveal pulsations with a period of about 0.1 s at all observed frequencies. Furthermore, the 0.1 s pulsations drift toward higher and lower frequencies, starting at about 1420 MHz. The polarization of pulsations increases with frequency and time. The remarkable fact that the detected 0.1 s period of pulsations does not depend on frequency in a very broad frequency range is discussed in terms of existing models of pulsations.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-009-9496-5