The Magnetosphere and Plasmasphere

CSI 769

3rd section, Oct. – Nov. 2005

J. Guillory

• Lecture 8 (Oct.25) • Bow shock scattering; Magnetosphere structure, charged particle orbits

– Advance reading: Gombosi Ch.1 & 6 (and/or Parks Ch. 4, 8 &10).and Sci. Am. Apr. 1991: Collisionless Shock Waves

• Lecture 9 (Nov. 1) • Dawn-dusk electric field; gyrokinetic codes; magnetotail & current sheet

– Advance reading: Gombosi Ch. 7 & 14, Parks Sec. 7.8 & 11.5)

• Lecture 10 (Nov. 8)• MHD codes & boundary conditions; parallel E-fields & precipitation; satellite

diagnostics– Advance reading: Gombosi Ch. 4 , Parks Sec. 7.7

• In conjunction with the last topic: – Joel Fedder (NRL) is scheduled for a Space Sciences Seminar on his MHD

magnetosphere code, Wed. 10/26, 3:00 p.m., 206– Please attend.

Incoming particle scattering

• Stochastic Injection of Energetic Particles from Bow Shock and from Tailward reconnection region

• Nonadiabatic because gyroradius ~ B scale-length locally

• Particle orbit diffusion due to field fluctuations

Magnetic field geometry

Charged particle orbits, static B:

• Fast gyration about field line

• North-south bounce due to “magnetic mirror” force

• Slow east-west drift due to inhomogeneous magnetic field

• ExB drifts due to electric fields

Magnetosphere Simulation

• Particle codes, incl. gyro-averaged particle followers (e.g. Mary Hudson’s at Dartmouth)

• Fluid (MHD) codes– Fedder-Lyon-Mobarry code (NRL)– Spicer’s code(s): Odin etc.– BATSRUS (U. Michigan)

• Hybrid (particles and MHD) codes– Rice MSM code

• Models are available for community use:– CCMC: http://ccmc.gsfc.nasa.gov/– UCLA: http://www-ggcm2.igpp.ucla.edu/

• Source codes in public domain:– GEDAS (Japan, T. Ogino) (Japan, T.)

http://gedas22.stelab.nagoya-u.ac.jp/simulation/jst2k/hpf02.html

– BATSRUS: http://csem.engin.umich.edu/– NRL: http://www.lcp.nrl.navy.mil/hpcc-ess/software.html

• FCTMHD3D (C.R. DeVore)• AMRMHD3D (P. MacNeice)

– Zeus 3D MHD (Michael Norman): http://zeus.ncsa.uiuc.edu:8080/lca_intro_zeus3d.html

– CFD Codes: http://icemcfd.com/cfd/CFD_codes.html

Satellite sensors

Living With A Star Research Network

Solar Dynamics Observatory

Pole Sitter

Radiation Belt Mappers

Ionospheric Mappers

L1 Solar Sentinel

L2

Distributed network of spacecraft providing continuous observations

•Geospace Dynamics Nework with constellations of smallsats in key regions of geospace.

Cluster & Vortex

Cluster & Doublestar (DSP)

Image Satellite ENA sensors