Analysis of loop-top and foot-point sources in microwave bursts

Details Analysis of loop-top and foot-point sources in microwave bursts Analysis of loop-top and foot-point sources in microwave bursts

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..695s&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Other

Solar Microwave Bursts, Polarization, Loop

Scientific paper

The polarization of four microwave bursts with loop-top and foot-point sources at 17 GHz of Nobeyama Radioheliograph (NoRH) is analyzed. The loop-like structure of the four events is confirmed by the simultaneous photospheric magnetograms (SOHO/MDI) and EUV (TRACE) image or soft X-ray image (YOHKOH/SXT). Three events are located near the limb, and the other one is located 35° away from the center of solar disk. The three microwave sources in a given burst are polarized in the same sense. The polarization structure can be interpreted in terms of the extraordinary mode (e-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-point and loop-top sources of the flaring loop.

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