A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations

Details A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10510455s&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A5, p. 10455-10464

Physics

Plasma Physics

5

Solar Physics, Astrophysics, And Astronomy, And Astronomy: Corona, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Numerical Simulation Studies

Scientific paper

Recent Large-Angle and Spectrometric Coronagraph (LASCO) white light observations, ranging between 2RS and 32RS, trace accelerated density enhancements in the vicinity of the Sun which can be detected as enhancement in the intensity of the Thomson scattered light. One interpretation of these observed density enhancements is that they indicate moving plasmoids in the corona. Such plasmoids are accelerated away from the Sun by a Lorentz force due to the radial solar magnetic field. A model of accelerated plasmoids is presented which includes this magnetic acceleration, the Sun's gravitational attraction, and the aerodynamic drag acting on the plasmoid as it interacts with the solar wind. With reasonable choices of physical parameters the model produces velocity-height profiles close to the observed ones. Profiles for external initial Alfvén velocities vAe0=80, 350, and 450 km/s (external initial magnetic field Be0=0.04, 0.16, and 0.21 Gauss) at r0=5RS approximately match the lower, the middle, and the upper range of the observed velocity profiles, respectively. Choices for the ratio of the initial plasmoid number density ni0 and the initial solar wind number density ne0 of 2

Affiliated with

Also associated with

No associations

Rating

A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations 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 A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1195407