Movies of Velocity and Acoustic Flux in the Solar Photosphere

Details Movies of Velocity and Acoustic Flux in the Solar Photosphere Movies of Velocity and Acoustic Flux in the Solar Photosphere

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0605s&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #06.05; Bulletin of the American Astronomical Society, Vol. 24, p.737

Computer Science

Sound

Scientific paper

CCD images of FeI 5434 Angstroms line profiles have previously been collected and analyzed for the average characteristics of wave propagation in the photosphere. The previous analysis determined the velocity at nine depths in the spectral line and 100 horizontal spatial points spanning 70 arc sec. Time series of these velocity frames, lasting 37 minutes, have been Fourier transformed and filtered to pass the five minute modes of the Sun. Through the Hilbert transform and the analytic signal, the instantaneous velocity amplitude and phase were computed at every point in the three dimensional space of altitude, horizontal slit position and time. These data have been further processed to create color-contour maps of vertical acoustic propagation at each time sample. Velocity amplitude, velocity phase, kinetic energy density and acoustic flux are all mapped. Time series of these maps have been assembled into a movie which shows the evolution of vertical acoustic propagation. This movie is a complete visualization of sound waves in the photosphere, based on observation. The amplitude and kinetic energy density behaves as one might expect in the presence of the solar p-modes. However, the phase and acoustic flux have characteristic spatial and temporal scales which are very different from the amplitude. For example, upward and downward flux may occur in the same amplitude structure at different times, or at the same time. These results are consistent with the localized model of p-mode excitation advanced by Goode, Gough and Kosovichev.

Affiliated with

Also associated with

No associations

Rating

Movies of Velocity and Acoustic Flux in the Solar Photosphere 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 Movies of Velocity and Acoustic Flux in the Solar Photosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Movies of Velocity and Acoustic Flux in the Solar Photosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1512246