Abstract
Observations with an all-sky camera and high-speed patrol spectrograph of a peculiar auroral cloud or patch froa Saskatoon on the night of April 26/27, 1960, are reported. Interpretations of this phenomenon are given. (L.T.W.) The boundary between the geomagnetic field and the interplanetary media was found to be located at approximately 10 Re on the sunlit side of the earth near the equator. It was observed to fluctuate between 8 and 14 Re. A region of turbulent magnetic fields exists between the geomagnetic field boundary near 10 Re and another boundary located at 14-15 Re near the earth-sun line. The geomagnetic field inside the boundary is relatively quiet. An abrupt transition in the magnitude of fiuctuation occurs at the boundary surface. The ring current location appears to be above 1.4 and below 5 Re. Variation in altitude of the ring current with time appears likely. A brief review of the magnetometer instruments used is also given. (C.E.S.)
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