THEMIS Update and a Review of the Science Behind Magnetometer Signatures
By Laura Peticolas

2. Outline

3. Satellites Update

4. Ground-based Update

5. Earth’s magnetic fields

6. Magnetic Field Strength

7. Coordinate Systems

8. Geomagnetic (GEONS)

9. Compass-type (HDZ)

10. The GEONS Data

11. Earth’s Magnetic Field

12. Different Latitudes

13. Magnetosphere

14. Magnetosphere currents

15. Solar Wind (SW)

16. Effects of Ring Current on the Mag Data

17. Auroral Currents

18. Magnetic signatures of auroral substorms

19. Kp Index

20. Kp Index = 1

21. Kp Index = 7

22. Space Weather Effects

23. Storm and Substorms

24. THEMIS will determine which competing model is correct

25. Daytime (Sq) Currents

26. Ionosphere Effects

Coordinate Systems
Because magnetic fields have a direction, in
order to communicate about magnetic fields,
we need to define a coordinate system.
Three main coordinate systems are used for
magnetometer data:
Geographic (XYZ)
Geomagnetic (XYZ or HDZ - BEWARE!!)
Compass-type (HDZ)
THEMIS uses the coordinate systems:
geomagnetic (XYZ) and compass-type (HDZ)
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