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Apia Observatory October to December, 1939
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October 2–3—From 09h GMT, October 2, the H‐trace became disturbed and failed to rise to the usual maximum at about 23h. A steady decline in value commenced shortly after 01h, October 3, and a minimum value of approximately 34700 gammas was recorded at 03h 44m. Z was similarly affected but D was only very slightly disturbed. After the minimum value on October 3 the trace slowly returned to normal.
American Geophysical Union (AGU)
Title: Apia Observatory October to December, 1939
Description:
October 2–3—From 09h GMT, October 2, the H‐trace became disturbed and failed to rise to the usual maximum at about 23h.
A steady decline in value commenced shortly after 01h, October 3, and a minimum value of approximately 34700 gammas was recorded at 03h 44m.
Z was similarly affected but D was only very slightly disturbed.
After the minimum value on October 3 the trace slowly returned to normal.
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