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8. Security - check for the yellow padlock on the South Atlantic Anomaly site before you buy, and the s after http:/ /i.e. https:// = a secure site

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10. Payment - ready to pay for your South Atlantic Anomaly, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.

The South Atlantic Anomaly (or SAA) is the region where Earth's inner van Allen radiation belt makes its closest approach to the planet's surface. The result is that, for a given altitude, the radiation intensity is higher over this region than elsewhere. The SAA is alleged to be produced by a "Magnetic dip" in the Earth's magnetic field at that location, caused by the fact that the center of Earth's magnetic field is offset from its geographic center by 450 kilometers (280 miles) . Some believe that the anomaly is a side effect of Geomagnetic reversal.

The South Atlantic Anomaly is of great significance to satellites and other spacecraft that orbit at several hundred kilometers altitude and at orbital inclinations between 0° and 60°; these orbits take satellites through the Anomaly periodically, exposing them to several minutes of strong radiation each time. The International Space Station, orbiting with an inclination of 51.6°, required extra shielding to deal with this problem. The Hubble Space Telescope does not take observations while passing through the SAA.

The SAA itself varies in size depending on the magnetic field of the earth, which is largely dependent on the activity of the sun. The longitudinal and latitudinal size of the SAA is also dependent on the altitude you are considering. At an altitude of approximately 500 Km, the SAA spans from -50° to 0° geographic latitude and from -90° to +40° longitude.



The SAA drifts to the west at a speed of about 0.3 degrees per year, and is noticeable in the figures below. The drift rate of the SAA is very close to the rotation differential between the Earth#Internal structure and its surface, estimated to be between 0.3 and 0.5 degrees per year.



References

The South Atlantic Anomaly (or SAA) is the region where Earth's inner van Allen radiation belt makes its closest approach to the planet's surface. The result is that, for a given altitude, the radiation intensity is higher over this region than elsewhere. The SAA is alleged to be produced by a "Magnetic dip" in the Earth's magnetic field at that location, caused by the fact that the center of Earth's magnetic field is offset from its geographic center by 450 kilometers (280 miles) . Some believe that the anomaly is a side effect of Geomagnetic reversal.

The South Atlantic Anomaly is of great significance to satellites and other spacecraft that orbit at several hundred kilometers altitude and at orbital inclinations between 0° and 60°; these orbits take satellites through the Anomaly periodically, exposing them to several minutes of strong radiation each time. The International Space Station, orbiting with an inclination of 51.6°, required extra shielding to deal with this problem. The Hubble Space Telescope does not take observations while passing through the SAA.

The SAA itself varies in size depending on the magnetic field of the earth, which is largely dependent on the activity of the sun. The longitudinal and latitudinal size of the SAA is also dependent on the altitude you are considering. At an altitude of approximately 500 Km, the SAA spans from -50° to 0° geographic latitude and from -90° to +40° longitude.



The SAA drifts to the west at a speed of about 0.3 degrees per year, and is noticeable in the figures below. The drift rate of the SAA is very close to the rotation differential between the Earth#Internal structure and its surface, estimated to be between 0.3 and 0.5 degrees per year.



References

South Atlantic Anomaly - Wikipedia, the free encyclopedia
The South Atlantic Anomaly (or SAA) is the region where Earth 's inner van Allen radiation belt makes its closest approach to the planet's surface.

The South Atlantic Anomaly
This site is intended for students age 14 and up, and for anyone interested in learning about our universe.

Messages from Space - Trapped Radiation and the South Atlantic Anomaly ...
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ROSAT Display: South Atlantic Anomaly
Please use the Feedback link if you have questions on ROSAT. This file was last modified on Thursday, 28-Oct-1999 17:52:14 EDT

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What is the South Atlantic Anomaly? The Earth is surrounded by a pair of concentric donut-shaped clouds called the Van Allen radiation belts which, like magnetic bottle, store and ...

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What causes the SAA?
In a previous question you have told us what the boundaries of the South Atlantic Anomaly are. Can you please tell me what causes the SAA? The Answer

Image:South Atlantic Anomaly.svg - Wikipedia, the free encyclopedia
South_Atlantic_Anomaly.svg ‎ (SVG file, nominally 474 × 292 pixels, file size: 18 KB) edit] Summary. This is vector recreation of this PD image: http://en.wikipedia.org/wiki ...

South Atlantic
Free air gravity anomaly of the northern South Atlantic with flow lines and isochrons superimposed on the lower diagram.

Visible Earth: MISR Shows South Atlantic Anomaly
NASA's Visible Earth catalog of NASA images and animations of our home planet ... The South Atlantic Anomaly (SAA). Even before the cover opened, the Multi-angle Imaging ...