EUV Observations of the Structure and Dynamics of the Plasmasphere Bill R. Sandel, Jerry Goldstein, Dennis Gallagher, & Don Carpenter
The Plan EUV Measurements Trough Formation Plasmasphere Erosion Bite-Outs (Low Density Regions) Flux Tube Refilling
The scattering rate or “g-value”: g = ~1.1 sec -1 for He + at 1 AU The light detected by EUV comes from Resonant Scattering
Surface Brightness of the Plasmasphere The surface brightness is a line integral along the line of sight for each pixel:
Mapping image field points to the equatorial plane
To Sun Earth’s Shadow
Aurora Imperfect Flat-Fielding Between Cameras
Plasma Tail Plasmapause Plasmasphere
Extended Plasmasphere
Small Plasmasphere
(Thanks to Mark Moldwin)
Trough Forms by Wrapping a Tail 9 May
Plasmasphere Erosion Events 10 July 2000
Distance, Content vs. Time
Plasmasphere Erosion Events 2 June 2001
Bite-Outs in the Plasmasphere
CRRES Results Carpenter et al., JGR 105, 23,323 (2000)
Green et al., JGR in press
& 098 (7 & 8 April) 87% CoR
to 189 (5-7 July) 84% CoR
to 177 (24-25 June) 98% CoR
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
RealModelled
from Wilson et al., Adv. Space Res., Flux Tube Refilling--Expectations Latitude (degrees) H + Density (cm -3 )
26 August 2000 Isolated Refilling Flux Tube
20 August :26 UTC Model of an Isolated Filled Flux Tube Range7.9 R E Latitude49 N
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