Modeling of magnetic cloud expansion
Abstract
A model of an expanding elliptic cylindrical force-free flux rope is used to interpret in-situ magnetic cloud observations by spacecraft. Input quantities are measurements of magnetic field components and velocity magnitudes along a spacecraft trajectory inside a magnetic cloud. During the fitting procedure flux-rope geometric parameters and cloud expansion velocity are determined. Observed separate velocity components are not used in the fitting procedure, but in radial (expansion) velocity construction which is compared to model one to test our model more strictly. 24 magnetic clouds with clearly expressed expansion were fitted by the model. Radial velocity profiles qualitatively correspond to model ones in majority of cases (83%), in more than half of them (58%) quantitatively.
- Publication:
-
AAS/AGU Triennial Earth-Sun Summit
- Pub Date:
- April 2015
- Bibcode:
- 2015TESS....121003V