1. EUV Observations of the Structure and Dynamics of the Plasmasphere Bill R. Sandel, Jerry Goldstein, Dennis Gallagher, & Don Carpenter

2. The Plan EUV Measurements Trough Formation Plasmasphere Erosion Bite-Outs (Low Density Regions) Flux Tube Refilling

3. The scattering rate or “g-value”: g = ~1.1  10 -4 sec -1 for He + at 1 AU The light detected by EUV comes from Resonant Scattering

4. Surface Brightness of the Plasmasphere The surface brightness is a line integral along the line of sight for each pixel:

5. Mapping image field points to the equatorial plane

6. To Sun Earth’s Shadow

7. Aurora Imperfect Flat-Fielding Between Cameras

8. Plasma Tail Plasmapause Plasmasphere

9. Extended Plasmasphere

10. Small Plasmasphere

11. (Thanks to Mark Moldwin)

12. Trough Forms by Wrapping a Tail 9 May 2001 2001-129

19. Plasmasphere Erosion Events 10 July 2000

21. Distance, Content vs. Time

22. Plasmasphere Erosion Events 2 June 2001

25. Bite-Outs in the Plasmasphere

26. CRRES Results Carpenter et al., JGR 105, 23,323 (2000)

27. Green et al., JGR in press

30. 2001-097 & 098 (7 & 8 April) 87% CoR

31. 2000-187 to 189 (5-7 July) 84% CoR

32. 2000-176 to 177 (24-25 June) 98% CoR

33. Same as inner cavities observed by e.g. CRRES? CRESS*EUV Frequency13%less frequent Contrast5-10x2-4x Azimuthal Extentup to 20°10-18° Inner BoundaryL < 3~same LT Distribution< morning ? *Carpenter et al., JGR, 2000

34. 2000-176 2001-097 RealModelled

39. from Wilson et al., Adv. Space Res., 1993. Flux Tube Refilling--Expectations Latitude (degrees) H + Density (cm -3 )

40. 26 August 2000 Isolated Refilling Flux Tube

41. 20 August 2000 08:26 UTC Model of an Isolated Filled Flux Tube Range7.9 R E Latitude49 N

42. ?