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Apia Observatory October to December, 1947
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(Latitude 13° 48′,4 S., longitude 171° 46′.5 or 11h 27m.1 W. of Gr.)September 30‐October 3—A sudden commencement at 20h 02m GMT, September 30, introduced a period of moderate activity. Small, irregular movement disturbed the trace during October 1. H diminished fairly rapidly between 00h and 05h, October 2, after which stronger bay‐like movement developed. Conditions returned to normal at 14h, October 3. K‐index 5 was recorded during the fourth and eighth three‐hour periods, October 2, and the third three‐hour period, October 3.
American Geophysical Union (AGU)
Title: Apia Observatory October to December, 1947
Description:
(Latitude 13° 48′,4 S.
, longitude 171° 46′.
5 or 11h 27m.
1 W.
of Gr.
)September 30‐October 3—A sudden commencement at 20h 02m GMT, September 30, introduced a period of moderate activity.
Small, irregular movement disturbed the trace during October 1.
H diminished fairly rapidly between 00h and 05h, October 2, after which stronger bay‐like movement developed.
Conditions returned to normal at 14h, October 3.
K‐index 5 was recorded during the fourth and eighth three‐hour periods, October 2, and the third three‐hour period, October 3.
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