Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11b1580b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM11B-1580
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2778] Magnetospheric Physics / Ring Current
Scientific paper
This study explores the feasibility of performing operational estimates of the prompt Dst index using variations in the horizontal component (ΔBH) of the Earth’s magnetic vector detected by DMSP spacecraft while crossing the magnetic equator. Measurements are first compared with predictions of the 2005 International Geomagnetic Reference Field (IGRF) model. Then quiet-time offset baselines are established as functions of longitude for the years 2005 to 2009. Year-to-year progression of these baselines demonstrates the secular variation in the Earth’s main field. Thus, quiet-time baseline calculations for each spacecraft must be updated at regular intervals. Running-averaged values of ΔBH, inferred from magnetometers on DMSP F16 and F17 follow prompt Dst traces during active intervals of the 2005 to 2009 test interval. Stormtime increases in globally-average exospheric temperatures predicted from ΔBH variations are shown to be in reasonable agreement with those inferred from GRACE accelerometer measurements.
Burke William J.
Lin Chang-Shou
Wilson Gordon Ray
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