1 / 12

Geomagnetic Field and Particle Theory

This lecture explores the geomagnetic field's relationship with particle theory, focusing on the mechanics of fast and slow solar winds. Key topics include horizontal and vertical components of the geomagnetic field, magnetic indices (Kp, Dst, AE), and the behavior of solar wind particles influenced by geomagnetic forces. The material is supplemented with selected chapters from significant references, providing a comprehensive overview of gyro-motion, bounce motion, and drift motion of solar wind particles, alongside concepts such as magnetic mirroring and the loss cone.

kalkin
Télécharger la présentation

Geomagnetic Field and Particle Theory

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CSI 662 / ASTR 769 Lect. 07 Spring 2007 Mainly By Bob Weigel on March 6, 2007 Supplemented By Jie Zhang on March 27, 2007 Geomagnetic Field and Particle Theory • References: • Prolss: Chap. 5.1 – 5.3, P. 209-240 (main reference) • Tascione: Chap. 1.6 – 1.12, P4 -- P9; Chap. 4.0 -- 4.7, P43 --P50 (supplement) • Gombosi: Chap. 1, P3 – P23 (supplement)

  2. Fast and Slow Wind Earth Magnetic Field • Geomagnetic Poles • Horizontal component • Vertical component • Shell parameter • Footpoints • Curvature

  3. Fast and Slow Wind Magnetic Indices • Measuring the variation of horizontal magnetic field • Dst index: low latitude, hourly, global network • Kp index: middle latitude (48° to 63°), 3-hour • AE index: high latitude (62° to 72°) within aurora zone, 1 minute, not global

  4. Fast and Slow Wind Gyro-motion

  5. Fast and Slow Wind Bounce Motion

  6. Fast and Slow Wind Drift Motion: Gradient Drift

  7. Fast and Slow Wind Drift Motion: Curvature Drift

  8. Fast and Slow Wind Drift Motion: E drift • Ambipolar E X B drift

  9. Fast and Slow Wind DPS relationship

  10. Fast and Slow Wind Adiabatic Invariants • Periodic motion can be characterized by a conserved quantity under adiabatic condition: • General form I=∫pdq, p and q are generalized momentum and coordinate • 1. Magnetic moment invariant -- Gyromotion I = ∫pperdrg • 2. Bounce invariant I = ∫ppardspar • 3. Longitudinal drift invariant (L shell) I = ∫pdrdrdf

  11. Fast and Slow Wind Magnetic Mirroring • Pitch angle • Mirror point • Loss cone

  12. The End

More Related