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Cheltenham Magnetic Observatory, January to March, 1941
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January 16–21—On January 16 at 20h 30m GMT, a disturbance of mild proportions began and continued until the end of January 21. The greatest, K‐number during this interval was 5 which occurred eight times in the five days.January 23–28—The field again became disturbed on January 23 and continued so until January 28. During this time there were three K‐numbers as great as 5.
American Geophysical Union (AGU)
Title: Cheltenham Magnetic Observatory, January to March, 1941
Description:
January 16–21—On January 16 at 20h 30m GMT, a disturbance of mild proportions began and continued until the end of January 21.
The greatest, K‐number during this interval was 5 which occurred eight times in the five days.
January 23–28—The field again became disturbed on January 23 and continued so until January 28.
During this time there were three K‐numbers as great as 5.
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