Night-time geomagnetic variations at low latitudes

Details Night-time geomagnetic variations at low latitudes Night-time geomagnetic variations at low latitudes

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1523s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Dec. 1987, p. 1523-1539.

Computer Science

5

Equatorial Regions, Geomagnetism, Magnetic Variations, Nocturnal Variations, Annual Variations, D Region, Equatorial Electrojet, Field Aligned Currents, Harmonic Analysis, Magnetic Field Configurations, Ring Currents

Scientific paper

Using hourly values of the magnetic elements H, D and Z for 1964, 1965, their variation during nighttime hours is examined from both their monthly means and from a previously used harmonic analysis method. The data set used represents quiet magnetic conditions. Consistent changes during the night are often found. Seasonal changes are also examined and it seems necessary to modify the Malin-Isikara hypothesis of a moving ring current by including a seasonal modulation of ring current strength with equinoctial maximum and a local time-varying component or partial ring current. The nighttime D component shows considerable asymmetry between North and South hemispheres and this might be due to field-aligned current structure. There is a small amount of evidence for a nighttime westward equatorial electrojet enhancement.

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