The aurora at quiet magnetospheric conditions - Repeatability and dipole tilt angle dependence

Details The aurora at quiet magnetospheric conditions - Repeatability and dipole tilt angle dependence The aurora at quiet magnetospheric conditions - Repeatability and dipole tilt angle dependence

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3789o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3789-3797.

Physics

7

Auroras, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Dipoles, Solar Wind, Explorer 50 Satellite, Geomagnetic Latitude

Scientific paper

The notion of a ground state magnetosphere and the dependence of the auroral oval size and position on the dipole tilt angle are investigated. A technique to discern latitudinal and longitudinal shifts of the aurora without resorting to boundary specification is proposed. The first problem is addressed by a 2D correlation study of the repeatability of auroral emissions in corrected geomagnetic space at conditions of minimum energy transfer from the magnetosphere. The maximum expected value of the correlation measure is 0.65-0.9. The notion of a ground state magnetosphere is therefore supported by the present data. Repeatability was found at the same level regardless of time or reconfigurations of the magnetosphere between images and independent of magnetic time sector. The second problem is addressed by relating latitudinal shifts of the aurora with dipole tilt angle without resorting to auroral boundary specification. The latitude of the continuous aurora is found to be related to the dipole tilt angle at quiet magnetospheric conditions.

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