Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-03-06
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
24 pages, 17 figures
Scientific paper
We report on the physical properties of solar sequential chromospheric brightenings (SCBs) observed in conjunction with moderate-sized chromospheric flares with associated CMEs. To characterize these ephemeral events, we developed automated procedures to identify and track subsections (kernels) of solar flares and associated SCBs using high resolution H-alpha images. Following the algorithmic identification and a statistical analysis, we compare and find the following: SCBs are distinctly different from flare kernels in their temporal characteristics of intensity, Doppler structure, duration, and location properties. We demonstrate that flare ribbons are themselves made up of subsections exhibiting differing characteristics. Flare kernels are measured to have a mean propagation speed of 0.2 km/s and a maximum speed of 2.3 km/s over a mean distance of 5 x 10^3 km. Within the studied population of SCBs, different classes of characteristics are observed with coincident negative, positive, or both negative and positive Doppler shifts of a few km/s. The appearance of SCBs precede peak flare intensity by ~12 minutes and decay ~1 hour later. They are also found to propagate laterally away from flare center in clusters at 41 km/s or 89 km/s. Given SCBs distinctive nature compared to flares, we suggest a different physical mechanism relating to their origin than the associated flare. We present a heuristic model of the origin of SCBs.
Balasubramaniam K. S.
Jackiewicz Jason
James McAteer R. T.
Kirk Michael S.
Milligan Ryan O.
No associations
LandOfFree
Properties of Sequential Chromospheric Brightenings and Associated Flare Ribbons 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 Properties of Sequential Chromospheric Brightenings and Associated Flare Ribbons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Properties of Sequential Chromospheric Brightenings and Associated Flare Ribbons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-537894