Observation and Simulation of Longitudinal Oscillations of an Active Region Prominence

Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

12 pages, 8 figures

Scientific paper

Filament longitudinal oscillations have been observed on the solar disk in H$\alpha$. We intend to find an example of the longitudinal oscillations of a prominence, where the magnetic dip can be seen directly, and examine what is the restoring force of such kind of oscillations. We carry out a multiwavelength data analysis of the active region prominence oscillations above the western limb on 2007 February 8. Besides, we perform a one-dimensional hydrodynamic simulation of the longitudinal oscillations. The high-resolution observations by Hinode/SOT indicate that the prominence, seen as a concave-inward shape in lower-resolution Extreme Ultraviolet (EUV) images, actually consists of many concave-outward threads, which is indicative of the existence of magnetic dips. After being injected into the dip region, a bulk of prominence material started to oscillate for more than 3.5 hours, with the period being 52 min. The oscillation decayed with time, with the decay timescale being 133 min. Our hydrodynamic simulation can well reproduce the oscillation period, but the damping timescale in the simulation is 1.5 times as long as the observations. The results clearly show the prominence longitudinal oscillations around the dip of the prominence and our study suggests that the restoring force of the longitudinal oscillations might be the gravity. Radiation and heat conduction are insufficient to explain the decay of the oscillations. Other mechanisms, such as wave leakage and mass accretion, have to be considered. The possible relation between the longitudinal oscillations and the later eruption of a prominence thread, as well as a coronal mass ejection (CME), is also discussed.

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

Observation and Simulation of Longitudinal Oscillations of an Active Region Prominence 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 Observation and Simulation of Longitudinal Oscillations of an Active Region Prominence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observation and Simulation of Longitudinal Oscillations of an Active Region Prominence will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-289903

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