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By S. I. Akasofu, J. R. Kan

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Published via the yank Geophysical Union as a part of the Geophysical Monograph Series.

The American Geophysical Union has venerated Sydney Chapman through designating specific topical meetings as Chapman meetings. we're more than pleased that the AGU counseled this convention on "The Formation of Auroral Arcs" as a Chapman convention.

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Internat. Workshop Select. Magnetosph. , 15, 1979b. D. Anger, A uniform belt of diffuse auroral emission seen by the ISIS-2 scanning photometer, Planet. , 21, 799, 1973. , D. D. -I. J. D. R. Barrows, Simultaneous observations of particle precipitations and auroral emissions by the ISIS-2 satellite in the 19 - 24 MLT sector, J. Geophys. , aurora, Electron 82, 2210, 1977. Space Sci. , and polar 22, 223, 1978. F. Fennell, Signatures of electric fields from high and low altitude particles distributions, 4, 311, 1977.

5 ø, long. 8ø)as seen in the 3rd and 4th pictures. The 4th ann the 5th pictures evidently indicate that the protrusion consists of complex striations. Copyright American Geophysical Union Geophysical Monograph Series Physics of Auroral Arc Formation Vol. 25 OGUTI AUG. 25 1971 35 LOW LAT. SYOWA t E • 100 km Fig. 3. An example of splitting (or peeling) -fold over deformation of a discrete arc in small sizes (5-10 km), corresponding to the appearance and disappearance of ray structures. The left panel shows sequential pictures of a thin arc with time interval of 1/60 sec.

Pulsation begins partially in the protrusion, and gradually expands into whole structures. Top panel of Fig. 4 shows temporal variation of aurora from 2 stations along the magnetic meridian. The top is northern horizon, the bottom is southern horizon, and the darkness represents the auroral liminosity. A down-going trace indicates the equatorward expansion of the protrusion, and small dots on the trace represent pulsations. The pulsating aurora seen before 0659 UT is due to a formerly split branch.

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