Drift rate of the South Atlantic Anomaly

Details Drift rate of the South Atlantic Anomaly Drift rate of the South Atlantic Anomaly

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.2343b&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A2, p. 2343-2350

Physics

Plasma Physics

12

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Transport Processes

Scientific paper

A portion of the secular change of the geomagnetic field leads to a drift of the trapped belt South Atlantic Anomaly (SAA). If this drift is not taken into account, models of the trapped particle population give erroneous predictions of particle fluxes. The dose rates measured on two manned spacecrafts, Skylab (50° inclination×438km orbit) and Mir orbital station (51.65° inclination×400km orbit), were used to determine the drift rate of the SAA. The longitude and latitude drift rates of the SAA as a whole, between 1973 and 1995, were estimated to be 0.28+/-0.03°W per year, and 0.08+/-0.03°N per year, respectively. These measurements are consistent with determinations made using the AP8 models for radiation trapped belts and are in excellent agreement with drift rates observed for the geomagnetic field.

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