Physics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..573s&link_type=abstract
Planetary and Space Science, vol. 24, June 1976, p. 573-575.
Physics
9
Auroral Arcs, Geomagnetic Pulsations, Magnetic Storms, Sudden Storm Commencements, Tropical Regions, Auroral Electrojets, Geomagnetism, Magnetic Disturbances
Scientific paper
Coincidence between the onset of sudden brightening of the auroral arc in the auroral oval and the onset of Pi2 magnetic pulsation in low latitudes is examined based on the auroral data obtained at a chain of stations in Alaska and the Pi2 data obtained at the low-latitude station at Onagawa, Japan. The result shows that the low-latitude Pi2 occurs almost simultaneously with the sudden brightening of the auroral arc; i.e., the onset of an auroral substorm (T = 0). It is concluded that the onset of substorms can be identified quite well with the onset of the low-latitude Pi2.
Saito Takesi
Sakurai Takashi
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