RHESSI Observations of the Size Scales of Solar Hard X-ray Sources

Details RHESSI Observations of the Size Scales of Solar Hard X-ray Sources RHESSI Observations of the Size Scales of Solar Hard X-ray Sources

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..210..273s&link_type=abstract

Solar Physics, v. 210, Issue 1, p. 273-286 (2002).

Physics

17

Scientific paper

The Reuven Ramaty High-Energy Solar Spectroscopic Imager RHESSI telescope produces hard X-ray images by Fourier imaging techniques that are capable of determining the sizes and shapes of sources with spatial scales in the range ˜ 2′′ 180′′. Applying the method of Unpixelized Forward Fitting to RHESSI modulation profiles from simple flares, we have identified the presence of `halo' sources whose size scale (˜ 40′′) greatly exceeds the `core' sizes (≤ 6′′ 14′′). Although such `core-halo' structures have been observed at radio wavelengths using a similar technique, the radio and hard X-ray phenomena may be different. These observations raise questions about the nature of these `halos'. Among the possibilities are that they are albedo sources, thin-target loops, or unidentified diffuse structures.

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