SPATIALLY AND SPECTRALLY RESOLVED OBSERVATIONS OF A ZEBRA PATTERN IN A SOLAR DECIMETRIC RADIO BURST
- Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
- National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
- Center for Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ 07102 (United States)
- Space Weather Research Laboratory, New Jersey Institute of Technology, Newark, NJ 07102 (United States)
We present the first interferometric observation of a zebra-pattern radio burst with simultaneous high spectral ({approx}1 MHz) and high time (20 ms) resolution. The Frequency-Agile Solar Radiotelescope Subsystem Testbed (FST) and the Owens Valley Solar Array (OVSA) were used in parallel to observe the X1.5 flare on 2006 December 14. By using OVSA to calibrate the FST, the source position of the zebra pattern can be located on the solar disk. With the help of multi-wavelength observations and a nonlinear force-free field extrapolation, the zebra source is explored in relation to the magnetic field configuration. New constraints are placed on the source size and position as a function of frequency and time. We conclude that the zebra burst is consistent with a double-plasma resonance model in which the radio emission occurs in resonance layers where the upper-hybrid frequency is harmonically related to the electron cyclotron frequency in a coronal magnetic loop.
- OSTI ID:
- 21578307
- Journal Information:
- Astrophysical Journal, Vol. 736, Issue 1; Other Information: DOI: 10.1088/0004-637X/736/1/64; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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