Ephemeral active regions in 1970 and 1973
K. L. HarveyVisiting Astronomer,
Kitt Peak National Observatory, U.S.AJ. W. HarveyKitt Peak National Observatory, Tucson, Ariz., U.S.AS. F. MartinLockheed Solar Observatory, Burbank, Calif., U.S.A
1975en
ABI
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