Density Structure in a Pre-Eruption Coronal Flux Loop

Details Density Structure in a Pre-Eruption Coronal Flux Loop Density Structure in a Pre-Eruption Coronal Flux Loop

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh22a0179k&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH22A-0179

Physics

7513 Coronal Mass Ejections, 7524 Magnetic Fields, 7531 Prominence Eruptions

Scientific paper

A density model is developed for a coronal loop, extending from the collisionless corona (ν i << Ω i) down to foot points in the highly-collisional chromosphere (ν i >> Ω i), under the approximation that neighboring flux surfaces within the flux loop are ``non interacting''. This model, valid if the characteristic fluid-element speed is large enough (v > vc), results in a density enhancement at the edge of the loop which is a function of its specified magnetic field. Here, vc is the critical fluid-element speed: for v < vc, the number of collisions occurring during a single transit of the loop is large enough to diffuse away the density enhancement that exists in the limit of zero collisions in coronal segment of the loop. For solar parameters, vc ˜= 1 km/s. It is shown that this model can explain the post-eruption density enhancement (the bright rim) observed in coronal mass ejections. This result is distinct from coronal loop models in which the fluid elements making up the plasma are assumed to be static and collisionally-coupled (such models have been used to address thermal properties, rather than the three-dimensional density structure, of coronal loops). Work supported by ONR and NASA.

Affiliated with

Also associated with

No associations

Rating

Density Structure in a Pre-Eruption Coronal Flux Loop does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Density Structure in a Pre-Eruption Coronal Flux Loop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Density Structure in a Pre-Eruption Coronal Flux Loop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1644881