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Solar hydrogen Lyman‐α variation during solar cycles 21 and 22
Author(s) -
Tobiska W. Kent,
Pryor Wayne R.,
Ajello Joseph M.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl00835
Subject(s) - solstice , orbiter , solar maximum , solar irradiance , irradiance , solar cycle 22 , physics , solar cycle , sky , environmental science , atmospheric sciences , airglow , spectrometer , astronomy , solar wind , optics , plasma , quantum mechanics , latitude
A full‐disk, line‐integrated solar Lyman‐α dataset is presented that spans two solar cycles. The dataset is created partially from AE‐E and SME data that is scaled to the Pioneer Venus Orbiter Ultraviolet Spectrometer (PVOUVS) upwind Lyman‐α sky background data which is converted to a solar surrogate. PVOUVS measurements overlap AE‐E, SME, and UARS observing periods and are calibrated to UARS/SOLSTICE irradiance units at 1 AU. The scaled AE‐E/SME, the SOLSTICE, and the PVOUVS surrogate data in the interim between the satellites collectively form a composite dataset with a quiet sun value of 3.0±0.1 × 10 11 photons cm −2 s −1 common for three solar minima and a solar maximum value of 6.75±0.25 × 10 11 photons cm −2 s −1 common to cycles 21 and 22.