Other
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13.1134v&link_type=abstract
Annales Geophysicae, vol. 13, Issue 11, pp.1134-1143
Other
5
Scientific paper
A study of dayside auroral conjugacy has been done using the cleft/boundary layer auroral particle boundaries observed by the DMSP-F7 satellite in the southern hemisphere and the global UV auroral images taken by the Viking spacecraft in the northern hemisphere. The 22 events have been studied on the basis of an internal IGRF 1985 magnetic field; it is shown that there is a displacement of up to 4° in latitude from the conjugate points with the northern aurora appearing to be located poleward of the conjugate point. No local time dependence of the north-south auroral location difference was seen. The use of a more realistic magnetic field model for tracing field lines which incorporates the dipole tilt angle and Kp index, the Tsyganenko 1987 long model plus the IGRF 1985 internal magnetic field model, appears to organize the data better. Although with this external plus internal model some tracings did not close in the opposite hemisphere, 70% of those that did indicated satisfactory conjugacy. The study shows that the degree of auroral conjugacy is dependent upon the accuracy of the magnetic field model used to trace to the conjugate point, especially in the dayside region where the field lines can either go to the dayside magnetopause near the subsolar point or sweep all the way back to the flanks of the magnetotail. Also the discrepancy in the latitude of northern and southern aurora can be partially explained by the displacement of the neutral sheet (source region of the aurora) by the dipole tilt effect. Acknowledgements. We want to express our gratitude to Alain Weill, who manages the SOFIA program, and to all colleagues who contributed to the experiment. We are very grateful to people from the "Institut Géographique National", the "Division Technique de l'Institut National des Sciences de l'Univers (INSU)" and the "Centre d'Aviation Météorologique de Météo-France" who operated the aircraft and processed the data. Frédérique Saïd provided us with very helpful comments on the manuscript. This work was financially supported by the "Programme Atmosphère et Océan à Moyenne Echelle de l'INSU". Topical Editor G. Komen thanks K. B. Katsaros and another referee for their help in evaluating this paper.--> Correspondence to: P. Durand-->
Hearn D.
Meng Ching I.
Murphree John S.
Newell Patrick T.
Vo Hien-Bich
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