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Sitka Magnetic Observatory, January to March, 1941
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January 17–19—A sudden commencement was recorded at 00h 10m GMT, January 17; the disturbance gradually increased but was not very great at any time. By the close of January 19 the conditions were normal. Ranges: D, 40′; H, 552 gammas; Z, 405 gammas.January 23–25—A moderately disturbed period began gradually at about 08h GMT, January 23, with the disturbance increasing gradually in intensity until about 13h, January 24. It then began to subside. The magnetic elements were normal at the close of January 25.
American Geophysical Union (AGU)
Title: Sitka Magnetic Observatory, January to March, 1941
Description:
January 17–19—A sudden commencement was recorded at 00h 10m GMT, January 17; the disturbance gradually increased but was not very great at any time.
By the close of January 19 the conditions were normal.
Ranges: D, 40′; H, 552 gammas; Z, 405 gammas.
January 23–25—A moderately disturbed period began gradually at about 08h GMT, January 23, with the disturbance increasing gradually in intensity until about 13h, January 24.
It then began to subside.
The magnetic elements were normal at the close of January 25.
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