Polarization of loop-top and footpoint sources in microwave bursts

Details Polarization of loop-top and footpoint sources in microwave bursts Polarization of loop-top and footpoint sources in microwave bursts

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..219..159s&link_type=abstract

Solar Physics, v. 219, Issue 1, p. 159-168 (2004).

Physics

5

Scientific paper

The polarization is analyzed in four microwave bursts with one loop-top and two footpoint sources observed at 17 GHz with the Nobeyama Radioheliograph (NoRH). The loop-like structure of the four events is confirmed by simultaneous SOHO/MDI magnetograms and TRACE/EUV images or Yohkoh/SXT images. The heliocentric distance of the four events is greater than 30°. The three microwave sources in each given burst are polarized in the same sense. This may be interpreted in terms of extraordinary mode emission, taking into account the polarity of the underlying magnetic field and propagation effects, which may lead to inversion of the sense of polarization in the limbward foot and loop-top source of the flaring loop.

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