The morphology of the IQSY auroral oval: 2. Auroral alignments in and near the auroral oval

摘要: The azimuths of extended auroral features have been measured on all-sky camera photographs from Barrow, Alaska (dp [dipole] 68°) and T-3 Ice Island 78°) during the IQSY period 1964–1965. arc alignments at Barrow are parallel for all hours to IGY. This suggests that independent solar cycle. alignments, when plotted in polar diagram form with previous alignment data several IGY stations show two separate functions nighttime hours. bimodal behavior is interpreted dp 78° near transition region between generally east-west-aligned statistical zone earth-sun-oriented arcs bands cap. On nightside both ovals situated 66°), but dayside oval very 78°. For noon, includes high-latitude day-side aurora 78°, alignment, while east-west, best described as perpendicular earth-sun vector.