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Tucson Magnetic Observatory April to June, 1940
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April 2–4—At 16h GMT, April 2, minor activity started, with some increase in disturbance until 01h 30m, April 3, at which time there was a considerable increase, H having a range of 120 gammas and D a range of 15′ within one hour. This long‐period activity continued for seven hours and was followed by short‐period activity of small amplitudes to 23h, April 3. A slightly disturbed condition prevailed for about one day longer with no definite ending.April 25–26—A moderate storm began at 02h 05m GMT, April 25, with an increase in H of 45 gammas in two minutes, followed by a decrease of 190 gammas to a minimum at 05h 00m and then a return to normal. During the same period D increased 25′ and returned to normal at about the time of the minimum in H. The storm continued with moderate long‐period changes and a lowered H to an indefinite ending at about 12h, April 26.
American Geophysical Union (AGU)
Title: Tucson Magnetic Observatory April to June, 1940
Description:
April 2–4—At 16h GMT, April 2, minor activity started, with some increase in disturbance until 01h 30m, April 3, at which time there was a considerable increase, H having a range of 120 gammas and D a range of 15′ within one hour.
This long‐period activity continued for seven hours and was followed by short‐period activity of small amplitudes to 23h, April 3.
A slightly disturbed condition prevailed for about one day longer with no definite ending.
April 25–26—A moderate storm began at 02h 05m GMT, April 25, with an increase in H of 45 gammas in two minutes, followed by a decrease of 190 gammas to a minimum at 05h 00m and then a return to normal.
During the same period D increased 25′ and returned to normal at about the time of the minimum in H.
The storm continued with moderate long‐period changes and a lowered H to an indefinite ending at about 12h, April 26.
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