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Sitka Magnetic Observatory October to December, 1939
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October 3–4—A small disturbance began gradually at about 08h 30m GMT, October 3, and increased slowly during the first five hours. The conditions continued mildly disturbed until 15 h, October 4. Ranges: D, 126′; H, 1053 gammas; Z, 760 gammas.October 6—A short period of disturbance occurred between 04h and 11h GMT, October 6. H increased steadily during the first period until 05h 30m, then suddenly decreased 450 gammas during the next ten minutes. Thereafter the traces gradually returned to normal. Ranges: D, 102′; H, 585 gammas; Z, 500 gammas.
American Geophysical Union (AGU)
Title: Sitka Magnetic Observatory October to December, 1939
Description:
October 3–4—A small disturbance began gradually at about 08h 30m GMT, October 3, and increased slowly during the first five hours.
The conditions continued mildly disturbed until 15 h, October 4.
Ranges: D, 126′; H, 1053 gammas; Z, 760 gammas.
October 6—A short period of disturbance occurred between 04h and 11h GMT, October 6.
H increased steadily during the first period until 05h 30m, then suddenly decreased 450 gammas during the next ten minutes.
Thereafter the traces gradually returned to normal.
Ranges: D, 102′; H, 585 gammas; Z, 500 gammas.
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