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Related Experiment Videos

REM measurements aboard MIR during 1995.

P Buhler1, L Desorgher, A Zehnder

  • 1Paul Scherrer Institute, Villigen, Switzerland.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|September 7, 2001
PubMed
Summary

The South Atlantic Anomaly (SAA) radiation increased by 25% between 1994-1996, coinciding with lower solar radio flux. This finding helps explain the SAA

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Area of Science:

  • Space physics
  • Radiation environment monitoring
  • Geophysics

Background:

  • The South Atlantic Anomaly (SAA) is a region where Earth's inner radiation belts come closest to the surface.
  • SAA radiation levels are influenced by solar activity and atmospheric density.
  • Previous studies have indicated variations in SAA intensity over time.

Purpose of the Study:

  • To present measurements of the SAA radiation environment.
  • To investigate the relationship between SAA intensity and solar radio flux.
  • To analyze the anisotropy of proton fluxes within the SAA.

Main Methods:

  • Utilized data from the Radiation Environment Monitor (REM) aboard the Mir space station.
  • Collected measurements from November 1994 to February 1996.
  • Analyzed radiation data in conjunction with radio solar flux measurements.

Main Results:

  • Observed a 25% increase in SAA radiation during the study period.
  • Correlated this increase with a simultaneous decrease in radio solar flux.
  • Confirmed anisotropic proton flux distribution due to atmospheric density gradients (loss cone, east-west effect).

Conclusions:

  • The observed increase in SAA radiation is linked to lower solar radio flux.
  • Basic models can account for the measured proton flux distribution and anisotropy.
  • Findings contribute to understanding the dynamics of Earth's radiation belts.

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