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3. Kp index correlations with solar wind parameters during the first and second stages of a recurrent geomagnetic store;Bobrov;Planet. Space Sci.,1973
4. J. D. Bohlin D. M. Rubenstein A Synoptic maps of solar coronal hole boundaries derived from HeII 304Å spectroheliograms from the manned Skylab missions NOAA Rept. UAG-51 1975
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