Simultaneous observations of auroras from the South Pole station and of precipitating electrons by Isis 1

Journal Article · Mon Oct 01 04:00:00 EDT 1973 · J. Geophys. Res., v. 78, no. 28, pp. 6579-6594

DOI:https://doi.org/10.1029/JA078i028p06579· OSTI ID:4346894

Winningham, J D; Akasofu, S; Yasuhara, F; Heikkila, W J

On the basis of the simultaneous observations of auroras from the South Pole and of precipitating electrons by the Isis 1 satellite it is shown that (1) a midday auroral arc (photographed on black and white film) occurs within the cleft (cusp) region projected to the appropriate auroral height along the geomagnetic field; (2) in the evening sector an aurora, observed by Isis 1 and the Souih Pole all-sky camera, extended for at least 5 hours of local geomagnetic time in the expected position of the auroral oval; and (3) during a period of extreme magnetic quiet, cleftlike electrons were observed just poleward of a narrow region of intense precipitation in the midnight sector. An earth-sun oriented arc was seen at the projected location of the intense electron flux. The pitch angle distribution of > 40-kev electrons in the vicinity of this precipitation was peaked at 90 deg , indicating that this particular arc as on closed field lines. (auth)

• Research Organization: University of Texas at Dallas, Dallas, Texas, 75230
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-022142
• OSTI ID: 4346894
• Journal Information: J. Geophys. Res., v. 78, no. 28, pp. 6579-6594, Journal Name: J. Geophys. Res., v. 78, no. 28, pp. 6579-6594; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

*AURORAE-- ELECTRON PRECIPITATION
ELECTRONS
FLUX DENSITY
N58100* --Physics (Atmospheric)--Auroral & Ionospheric Phenomena
POLAR REGIONS
SATELLITES