Detecting the widths of shock fronts preceding coronal mass ejections

Details Detecting the widths of shock fronts preceding coronal mass ejections Detecting the widths of shock fronts preceding coronal mass ejections

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54..173e&link_type=abstract

Astronomy Reports, Volume 54, Issue 2, pp.173-183

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The perturbed zones and shocks preceding coronal mass ejections (CMEs) are studied using the data of the Mark 4, LASCO C2, and LASCO C3 coronagraphs. Detection of the perturbed zone indicating the presence or absence of the shock is most reliable in a frame moving with the frontal structure of the CME. The ability to correctly measure the width δ F of the shock front using the Mark 4 and LASCO C2 data is established. The front width δ F observed along the streamer belt at distances R < 5 R &sun; from the center of the Sun is of the order of the mean free path of protons. This means that the energy dissipation in the shock front is collisional at such distances. At distances R ≥ (10 - 15) R &sun;, a new discontinuity with a front δ* F ≪ δ F is formed in the leading portion of the front. Within the errors, δ* F ≈ (0.1-0.2) R &sun; is independent of the distance R and is determined by the LASCO C3 spatial resolution. Initially, the discontinuity on the scale δ* F is weak and coexists with the front with width δ F . The relative amplitude of this discontinuity increases and the brightness profile behind it flattens as long as the distance R increases. This transformation of the brightness profile from a front of width δ F to a discontinuity of width δ* F ≪ δ F is explained as a transition from a collisional to a collisionless shock.

Affiliated with

Also associated with

No associations

Rating

Detecting the widths of shock fronts preceding coronal mass ejections 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 Detecting the widths of shock fronts preceding coronal mass ejections, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detecting the widths of shock fronts preceding coronal mass ejections will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1310184