Detection of geomagnetically aligned currents associated with an auroral arc

摘要: A rocket-borne experiment consisting of a vector magnetometer system and energetic charged particle detectors was launched from Fort Churchill, Canada, over stable IBC II auroral arc at 2000 LT on February 26, 1969. Vector magnetic field profiles flux are presented which indicate the existence geomagnetically aligned sheet currents associated with visible arc. In particular, evidence is shown that suggests precipitated electrons in range 2 to 18 kev carry significant fraction total upward field-aligned current, but particles this apparently unimportant providing downward return current. The spatial relation structure current configuration discussed.