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A study of auroral arcs and draperies
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Summary—By means of parallactic photographs at Tromsö the heights and directions of auroral arcs and the heights of the draperies have been studied. The number of the pairs used is 355 for the arcs and 293 for the draperies. From the height‐statistics it is shown that the heights of arcs and draperies, according to classifications faint, medium, strong, and very strong, show a continuous decrease. For the auroras of medium intensity it is shown that there is definite evidence of a displacement of the height‐curves from ebb‐tide to flood‐tide conditions.The diurnal variation of the direction of the arcs during 16h to 24h, MET, is demonstrated for Tromsö, and a secular change in the mean directions is demonstrated when compared with Bravais' determinations in Bossekop during 1839–40.
Title: A study of auroral arcs and draperies
Description:
Summary—By means of parallactic photographs at Tromsö the heights and directions of auroral arcs and the heights of the draperies have been studied.
The number of the pairs used is 355 for the arcs and 293 for the draperies.
From the height‐statistics it is shown that the heights of arcs and draperies, according to classifications faint, medium, strong, and very strong, show a continuous decrease.
For the auroras of medium intensity it is shown that there is definite evidence of a displacement of the height‐curves from ebb‐tide to flood‐tide conditions.
The diurnal variation of the direction of the arcs during 16h to 24h, MET, is demonstrated for Tromsö, and a secular change in the mean directions is demonstrated when compared with Bravais' determinations in Bossekop during 1839–40.
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