The electron temperature inside plasma bubbles at a height of 600 km was first measured by means of Japan's seventh scientific satellite Hinotori which is an equator orbiting satellite with an inclination of 31°. During the period between June 1981 and February 1982, 724 plasma bubbles were detected and studied. The electron temperature inside the plasma bubbles is either higher or lower than that outside and can also be equal to the electron temperature outside, depending on the local time and on the place where the data were taken. Heating of electrons inside plasma bubbles sometimes occurs over the South Atlantic geomagnetic anomaly and over the Hawaiian anomaly where particle precipitation can frequently be observed.
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