On the origin of solar flare microwave radio bursts |
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| Affiliation: | 1. DeFENS, Department of Food, Environmental and Nutritional Sciences – Packaging Division, University of Milan, via Celoria 2, 20133 Milan, Italy;2. Novachem Industriale Srl, Via XX Settembre 30, 20025 Legnano, Italy;1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;1. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland;2. Scientific Center for Optical and Electron Microscopy, ETH Zurich, 8093 Zurich, Switzerland;3. Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), CNRS-IN2P3-Univ. Paris-Sud 11, UMR 8609, Bât. 108, 91405 Orsay, France;4. Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, 5232 Villigen PSI, Switzerland |
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| Abstract: | The broadband microwave radio bursts associated with solar flares are suggested to be synchrotron emission from relativistic positrons resulting from the decay of pions produced by the interaction of accelerated flare protons with the solar material.A detailed calculation is made of the positron yield and the resulting synchrotron spectrum, and good agreement is found between the calculated radioemission and the observed microwave flux density. It is suggested, therefore, that broadband microwave bursts are an indication of the presence of high density protons at the Sun even when such protons are not observable at the Earth. |
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