Extremely quiet nighttime currents and magnetic baselines at Canadian observatories for the separation of external and internal fields

Details Extremely quiet nighttime currents and magnetic baselines at Canadian observatories for the separation of external and internal fields Extremely quiet nighttime currents and magnetic baselines at Canadian observatories for the separation of external and internal fields

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7525w&link_type=abstract

Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7525-7538.

Physics

6

Geomagnetism, Magnetic Variations, Polar Regions, Atmospheric Electricity, Canada, Earth Magnetosphere, Ionospheric Currents, Night, Secular Variations

Scientific paper

A new method is proposed for the determination of periods of very quiet magnetic activity, by which the very quiet dark nighttime interval, when external ionospheric and magnetospheric sources are minimal, is used to establish the baseline or reference level for the analysis of the sources. Baselines determined from very quiet nighttime intervals were obtained from Canadian magnetic observatory data bases covering the 1973-1980 period by special selection and filtering techniques. The undisturbed field and its secular variation were determined, and the standard deviation of the quiet levels about a quadratic function was found to be 4-10 nT, marking a significant improvement in the delineation of the main field secular variation in high latitude regions. For some stations, the secular variation determined from these undisturbed levels was systematically different from that obtained from the annual means, due to an equivalent net westward auroral current system of about 40 kA.

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