Variability in the Periodicity of 27 Days in Solar Indices |
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Authors: | Kane RP |
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Institution: | 1.Instituto Nacional de Pesquisas Espacias – INPE, Caixa Postal 515, 12201-070, S?o José dos Campos, SP, Brazil ; |
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Abstract: | The short-term variation of solar indices, though typically near the solar rotation period of 27 days, can often deviate considerably
from 27 days, in a wide range ∼ 19–33 days. The peak locations are within a day or two for all solar indices, indicating that
the whole of the solar atmosphere is affected in a similar way. There are no systematic differences between the peaks of the
chromosphere and the corona as such, but F10, X-rays, and coronal green line, which have uncertainties about their solar altitudes of origin, do show some differences
(earlier peaks) as compared to other indices (chromospheric as well as coronal). |
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