6533b823fe1ef96bd127e10e
RESEARCH PRODUCT
MHD evolution of a fragment of a CME core in the outer solar corona
Salvatore OrlandoGiovanni PeresGiovanni PeresPaolo PaganoPaolo PaganoFabio RealeFabio Realesubject
Physicsbusiness.industryAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsThermal conductionAstrophysicsCoronaMagnetic fieldSpace and Planetary ScienceThermal insulationBeta (plasma physics)Physics::Space PhysicsRadiative transferCoronal mass ejectionAstrophysics::Solar and Stellar AstrophysicsMagnetohydrodynamicsbusinessSun: coronal mass ejections (CMEs) – magnetohydrodynamics (MHD) – Sun: coronadescription
Detailed hydrodynamic modeling explained several features of a fragment of the core of a Coronal Mass Ejection observed with SoHO/UVCS at 1.7 Ro on 12 December 1997, but some questions remained unsolved. We investigate the role of the magnetic fields in the thermal insulation and the expansion of an ejected fragment (cloud) traveling upwards in the outer corona. We perform MHD simulations including the effects of thermal conduction and radiative losses of a dense spherical or cylindrical cloud launched upwards in the outer corona, with various assumptions on the strength and topology of the ambient magnetic field; we also consider the case of a cylindrical cloud with an internal magnetic field component along its axis. We find that a weak ambient magnetic field (beta~20) with open topology provides both significant thermal insulation and large expansion. The cylindrical cloud expands more than the spherical one.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-01-05 |