The resistances of the photosphere and of a flaring coronal loop |
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| Authors: | Melrose D B McClymont A N |
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| Institution: | (1) Institute for Astronomy, University of Hawaii, 96822 Honolulu, HI, USA;(2) Present address: School of Physics, University of Sydney, Sydney, Australia |
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| Abstract: | We consider two aspects of solar flares from the point of view of circuit theory. First, we show that the so-called  dynamo models , which invoke an analogy between the Earth's magnetosphere-ionosphere circuit and the solar corona-photosphere circuit, are illfounded. Second, we consider the rate of coronal energy release in the impulsive phase of a modest flare, and show that, if the energy going into mass motion can be neglected, the corona must present a resistance of about 10–3  . Classical resistivity, even in a highly filamented circuit, cannot provide so high a resistance. Anomalous resistivity due to ion sound turbulence can provide the required resistance in this case, but is insufficient to explain the very high power levels inferred in some fast spikes. |
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