Polarization evidence for the isotropy of electrons responsible for the production of 5-20 keV X-rays in solar flares

An explanation of the way in which X-ray astronomers can search for linear polarization, which could result from a directed particle beam due to the behavior of the Compton cross-section for electron scattering (see the Tindo cartoon for the necessary solar scenario).

      There are other potentially useful kinds of polarization for solar flares or CMEs: circular polarization at microwave frequencies, as a result of the gyrosynchrotron emission, Faraday rotation of distant non-solar radio sources, or possible effects in the gamma-ray range. Of course the mainstream Thomson scattering of solar visible light as we see it in an eclpse, for example, is well known and needs no cartoons to illuminate it. But the physics is the same as the X-ray physics described here.