Further Constraints on Electron Acceleration in Solar Noise Storms |
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Authors: | Prasad Subramanian Peter A. Becker |
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Affiliation: | (1) Indian Institute of Astrophysics, Koramangala, Bangalore, 560034, India;(2) Center for Earth Observing and Space Research, School of Computational Sciences and Department of Physics and Astronomy, George Mason University, Fairfax, VA, 22030, U.S.A. |
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Abstract: | We reexamine the energetics of nonthermal-electron acceleration in solar noise storms. A new result is obtained for the minimum nonthermal-electron number density required to produce a Langmuir-wave population of sufficient intensity to power the noise-storm emission. We combine this constraint with the stochastic electron acceleration formalism developed by Subramanian and Becker (2005) to derive a rigorous estimate for the efficiency of the overall noise-storm emission process, beginning with nonthermal-electron acceleration and culminating in the observed radiation. We also calculate separate efficiencies for the electron acceleration–Langmuir wave generation stage and the Langmuir wave–noise-storm production stage. In addition, we obtain a new theoretical estimate for the energy density of the Langmuir waves in noise-storm continuum sources. |
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