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DTIC ADA1014856: On the Importance of Reverse Current Ohmic Losses ... |
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by Defense Technical Information Center |
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We consider the passage of a beam of non-thermal |
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electrons through the flaring solar atmosphere, paying |
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particular attention to the requirement that the beam be |
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stable to the generation of plasma turbulence. We then |
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compute the ratio of energy losses due to reverse current |
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ohmic heating, and heating by Coulomb collisions, |
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respectively, for the greatest flux which can pass stably |
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through the atmosphere. We show that this ratio is |
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determined by the low energy cutoff of the beam, by the |
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electron temperature of the ambient atmosphere, and by |
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the electron to ion temperature ratio theta. It is also |
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independent of the atmospheric density. The results show |
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that ohmic energy losses are undoubtedly important in the |
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initial transient state, in agreement with other authors, |
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but that their role is debatable in the flare atmosphere, |
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depending on the value of theta appropriate. Expected |
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values for theta during the impulsive phase of the flare |
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indicate that reverse current ohmic energy losses, and |
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their consequent effects on the electron beam dynamics |
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and the hard X-ray bremsstrahlung emission, may not be as |
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important as previously suggested; however, a fully time- |
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dependent analysis of the beam-target interaction is |
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necessary to fully resolve the issue. (Author) |
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Date Published: 2020-01-01 02:00:29 |
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Identifier: DTIC_ADA1014856 |
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Item Size: 8844678 |
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Language: english |
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Media Type: texts |
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