Average high latitude magnetic field - Variation with interplanetary sector and with season. II

Details Average high latitude magnetic field - Variation with interplanetary sector and with season. II Average high latitude magnetic field - Variation with interplanetary sector and with season. II

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1611l&link_type=abstract

Planetary and Space Science, vol. 22, Dec. 1974, p. 1611-1624.

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Annual Variations, Interplanetary Magnetic Fields, Ionospheric Currents, Magnetic Disturbances, Magnetic Field Configurations, Polar Regions, Earth Magnetosphere, Geomagnetism, Kp Index, Magnetic Measurement, Magnetic Variations

Scientific paper

Average high-latitude magnetic-field data from northern observatories are examined for three ranges of magnetic disturbance level, Kp = 1- to 1+, 2- to 3+ and greater than or equal to 4-. Except for 0 to 0800 hr MLT, 55 to 78 deg invariant latitude, during away interplanetary magnetic field sectors, the variations between season and sector have the same characteristics at all Kp ranges. Because the amplitude of sector differences is much larger at sunlit local times than in the midnight sector, it is concluded that the current system of Svalgaard (1973) is not adequate to describe the sector variations in magnetic disturbance. Other current systems are discussed briefly. The disturbance morphology and seasonal variation at all Kp levels confirms the results of previous studies which indicate that latitudinally broad current systems and nonionospheric sources are present in addition to latitudinally narrow electrojet currents.

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