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Sitka Magnetic Observatory, January to March, 1929
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February 17–18, 1929—This storm began gradually, being active several hours before large fluctuations were recorded. From 10h to 19h on February 17 the curves show considerable motion but relatively slow so that the curves can be clearly followed at all times.February 26–28, 1929—This storm had a very definite point of beginning. The storm was of magnetic character (1) for nearly a day before it shows the features of a (2) day. From 12h to 21h, February 27, and from 7h to 15h, February 28, considerable activity was recorded, particularly rapidly around 14h February 28 for about one hour. The light was increased at 17h February 27 so that the curves can be followed at all times.
American Geophysical Union (AGU)
Title: Sitka Magnetic Observatory, January to March, 1929
Description:
February 17–18, 1929—This storm began gradually, being active several hours before large fluctuations were recorded.
From 10h to 19h on February 17 the curves show considerable motion but relatively slow so that the curves can be clearly followed at all times.
February 26–28, 1929—This storm had a very definite point of beginning.
The storm was of magnetic character (1) for nearly a day before it shows the features of a (2) day.
From 12h to 21h, February 27, and from 7h to 15h, February 28, considerable activity was recorded, particularly rapidly around 14h February 28 for about one hour.
The light was increased at 17h February 27 so that the curves can be followed at all times.
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