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

 
 
 
Space Weather Effects
 
 
     Alaska    South Dakota    Oregon    Nevada  
(Kp=1)   X (nT):   13490  19000 17835 21630
(Kp=7)   X (nT):  ? 18940 17745 21585
Difference (nT): ? 60 90 45


  Remember, we said at the beginning that
• Earth’s magnetic field is
      0.000 052T = 52,000 nanotesla (nT) = 0.5 gauss (G)
• 1 nanotesla = 10-9
Changes in Earth’s magnetic field are typically 5-100 nT
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