Slow Magnetoacoustic Waves in Two-ribbon Flares

Details Slow Magnetoacoustic Waves in Two-ribbon Flares Slow Magnetoacoustic Waves in Two-ribbon Flares

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...730l..27n&link_type=abstract

The Astrophysical Journal Letters, Volume 730, Issue 2, article id. L27 (2011).

Astronomy and Astrophysics

Astronomy

6

Sun: Flares, Sun: Oscillations, Sun: X-Rays, Gamma Rays

Scientific paper

We demonstrate that disturbances observed to propagate along the axis of the arcade in two-ribbon solar flares at the speed of a few tens of km s-1, well below the Alfvén and sound speeds, can be interpreted in terms of slow magnetoacoustic waves. The waves can propagate across the magnetic field, parallel to the magnetic neutral line, because of the wave-guiding effect due to the reflection from the footpoints. The perpendicular group speed of the perturbation is found to be a fraction of the sound speed, which is consistent with observations. The highest value of the group speed grows with the increase in the ratio of the sound and Alfvén speeds. For a broad range of parameters, the highest value of the group speed corresponds to the propagation angle of 25°-28° to the magnetic field. This effect can explain the temporal and spatial structure of quasi-periodic pulsations observed in two-ribbon flares.

Affiliated with

Also associated with

No associations

Rating

Slow Magnetoacoustic Waves in Two-ribbon Flares 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 Slow Magnetoacoustic Waves in Two-ribbon Flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Slow Magnetoacoustic Waves in Two-ribbon Flares will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1184418