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

Effects of Ring Current on
the Mag Data

  • Charged particles circle Earth at about 10 Re (60,000 km) from Earth’s surface near the equator.
  • The electrons and the ions move in opposite directions, creating the ring current
  • Does this add to (strengthen) or subtract from (weaken) Earth’s core magnetic field at Carson City? This is mostly in the x-direction.
  • When disturbed, the ring current weakens Earth’s magnetic field even more. This is called a magnetic storm.
Previous Slide 16 of 26 Next