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The dynamics of solar surges

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Abstract

Curves of velocity as a function of height have been determined from time sequences of on- and off-band Hα filtergrams of four surges. The surges behave as predicted by the melon-seed mechanism. However, in the outward-moving material the deceleration taking place after the maximum velocity has been reached, is stronger than if gravity alone is acting in three of four cases; during the return phase, the acceleration toward the solar surface is less than free-fall in two of three cases. The braking force, opposing the motion, is proportional to the velocity of the surge material. Non-force-free effects in the magnetic field supporting the surge provide a reasonable explanation for the braking.

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  1. Dept. of Astronomy, University of Western Ontario, N6A 3K7, London, Canada

    J.-René Roy

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  1. J.-René Roy
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Roy, JR. The dynamics of solar surges. Sol Phys 32, 139–151 (1973). https://doi.org/10.1007/BF00152734

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  • DOI: https://doi.org/10.1007/BF00152734

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