Studies of modern and ancient solar energetic particles |
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Authors: | R C Reedy |
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Institution: | (1) Los Alamos National Laboratory, Mail Stop D436, 87545 Los Alamos, NM, USA |
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Abstract: | Modern solar energetic particles (SEPs) have been studied for about 50 years by satellites and groundbased observations. These
measurements indicate much about the nature of SEPs but cover too short a period to quantify the probabilities of very large
solar particle events. Many SEPs have high enough energies to make nuclides in material in which they interact. Radionuclides
measured in lunar samples have been used to extend the record about SEPs back several million years. Some new measurements
of modern SEPs during the last solar cycle and new results for nuclides made by SEPs in lunar samples are presented and their
implications discussed. Both the modern and ancient records need to be improved, and methods to get a better understanding
of solar energetic particles discussed. The fluxes of SEPs during the last million years show an increasing trend when averaged
over shorter radionuclide half-lives. |
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Keywords: | Solar energetic particles cosmogenic nuclides lunar rocks |
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