Secular variations around 2000 obtained from satellite and observatory data

Details Secular variations around 2000 obtained from satellite and observatory data Secular variations around 2000 obtained from satellite and observatory data

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10177b&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10177

Computer Science

Scientific paper

SECULAR VARIATIONS AROUND 2000 OBTAINED FROM SATELLITE AND OBSERVATORY DATA T. Bondar, V. Golovkov and S. Yakovleva Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS IZMIRAN, Troitsk, Moscow Reg., 142190, Russia golovkov@izmiran.rssi.ru/FAX: +7-095-3340124 Using coefficients of models, developed on base of the satellite measurements of the geomagnetic vector (missions Magsat and Oersted), as well as SV coefficients in model by Olsen (2002) a space-time model of the geomagnetic field changes on the time interval of 20 yrs duration was developed. Coefficients of this ST model were obtained as the Taylor series up to second derivative. Obtained parabolic space-time model was compared with data series from magnetic observatories. It is shown that deviation of this completely satellite based model relative observatory time series is rather big due to the geomagnetic jerk about 1990. Space-time model derived from data from observatories describes variations better but only for area covered enough with observatories. False foci over SE Pacific reach hundreds nT. A new approach of joint use of satellite and observatory data is proposed. This technique of space-time analysis permits decreasing averaged errors to a few tens nT on whole time interval and whole Earth’s surface including large ocean areas.

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