Abstract
A number of solar X-ray events above 10 keV and 20 keV were compiled in order to test for evidence of anisotropic emission. The results are not definite, although the two samples show apparently different behaviours.
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Pizzichini, G., Spizzichino, A. & Vespignani, G.R. On anisotropy of solar hard X-ray emission. Sol Phys 35, 431–439 (1974). https://doi.org/10.1007/BF00151966
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DOI: https://doi.org/10.1007/BF00151966