Abstract
We review some key hard X-ray (HXR) observations obtained from the Yohkoh and the Compton Gamma Ray Observatory (CGRO) spacecraft that recast our understanding of particle acceleration in solar flares:
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1.
Above-the-loop-top hard X-ray sources.
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2.
Conjugacy and simultaneity of double footpoint hard X-ray sources.
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3.
Electron time-of-flight measurements and scaling law.
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4.
Dichotomy of Hard X-ray time structures.
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5.
Electron trapping time measurements.
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6.
Bi-directionality of electron beams.
These key observations provide promising new constraints for particle acceleration models.
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Aschwanden, M.J. (1998). What did Yohkoh and Compton Change in Our Perception of Particle Acceleration in Solar Flares?. In: Watanabe, T., Kosugi, T., Sterling, A.C. (eds) Observational Plasma Astrophysics: Five Years of Yohkoh and Beyond. Astrophysics and Space Science Library, vol 229. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5220-4_45
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DOI: https://doi.org/10.1007/978-94-011-5220-4_45
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