Detection of three periodicities in a single oscillating coronal loop

Details Detection of three periodicities in a single oscillating coronal loop Detection of three periodicities in a single oscillating coronal loop

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...508.1485v&link_type=abstract

Astronomy and Astrophysics, Volume 508, Issue 3, 2009, pp.1485-1491

Astronomy and Astrophysics

Astrophysics

10

Magnetohydrodynamics (Mhd), Sun: Corona, Sun: Oscillations

Scientific paper

Context: TRACE 171 Å observations of transverse loop oscillations on May 13, 2001 have been studied by De Moortel & Brady (2007). They found hints of 3 periodicities present in this event. Aims: The aim of this article is to improve the analysis, and measure the periodicities more accurately in order to do coronal seismology. Methods: We create multiple (x,t)-slices across the loop, and determine the oscillatory parameters within those slices. We then use statistical methods to reduce the errors on the measured oscillations parameters. Results: We find two populations with a clearly distinct period. The population at the loop top has a period of 895±2~s, while the population in the loop leg has a period of 452±1~s. The fact that the ratio of these two periods is roughly 2 and the geometry of the problem suggests that two harmonics are observed. In the residues, we confirm the presence of a 3rd harmonic with period 309±15~s using two separate data analysis techniques. The three periods are then used to do a seismological estimate of the loop expansion and the density scale height.

Affiliated with

Also associated with

No associations

Rating

Detection of three periodicities in a single oscillating coronal loop 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 Detection of three periodicities in a single oscillating coronal loop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of three periodicities in a single oscillating coronal loop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1765206