Analysis of characteristic parameters of large-scale coronal waves observed by STEREO/EUVI

Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Accepted for ApJ

Scientific paper

The kinematical evolution of four EUV waves, well observed by the Extreme UltraViolet Imager (EUVI) onboard the Solar-Terrestrial Relations Observatory (STEREO), is studied by visually tracking the wave fronts as well as by a semiautomatized perturbation profile method leading to results matching each other within the error limits. The derived mean velocities of the events under study lie in the range of 220-350 km/s. The fastest of the events (May 19, 2007) reveals a significant deceleration of \approx -190 m s-2 while the others are consistent with a constant velocity during the wave propagation. The evolution of the maximum intensity values reveals initial intensification by 20 up to 70%, and decays to original levels within 40-60 min, while the width at half maximum and full maximum of the perturbation profiles are broadening by a factor of 2 - 4. The integral below the perturbation profile remains basically constant in two cases, while it shows a decrease by a factor of 3 - 4 in the other two cases. From the peak perturbation amplitudes we estimate the corresponding magnetosonic Mach numbers Mms which are in the range of 1.08-1.21. The perturbation profiles reveal three distinct features behind the propagating wave fronts: coronal dimmings, stationary brightenings and rarefaction regions. All of them appear after the wave passage and are only slowly fading away. Our findings indicate that the events under study are weak shock fast-mode MHD waves initiated by the CME lateral expansion.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Analysis of characteristic parameters of large-scale coronal waves observed by STEREO/EUVI 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 Analysis of characteristic parameters of large-scale coronal waves observed by STEREO/EUVI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analysis of characteristic parameters of large-scale coronal waves observed by STEREO/EUVI will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-477908

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.