Acoustic Power Maps of Solar Active Regions

Details Acoustic Power Maps of Solar Active Regions Acoustic Power Maps of Solar Active Regions

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...504.1029h&link_type=abstract

Astrophysical Journal v.504, p.1029

Astronomy and Astrophysics

Astronomy

60

Sun: Magnetic Fields, Sun: Oscillations, Sun: Photosphere

Scientific paper

Using observations made by the Michelson Doppler Imager (MDI), we find that within solar active regions the spatial distributions of Doppler velocity power and continuum intensity power differ. The oscillation power within any pixel is a strong function of the magnetic field strength within that pixel. The amplitudes of oscillations with frequencies less than 5.2 mHz decrease with field strength for both velocity and continuum intensity measurements. However, within active regions oscillations with frequencies between 5.2 and 7.0 mHz have suppressed continuum intensity amplitudes but enhanced velocity amplitudes. The enhancement of the high-frequency velocity signal is largest in pixels with intermediate field strength (50-250 G) and is a manifestation of the high-frequency acoustic halos. We find that the high-frequency halos are absent in MDI observations of the continuum intensity.

Affiliated with

Also associated with

No associations

Rating

Acoustic Power Maps of Solar Active Regions 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 Acoustic Power Maps of Solar Active Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic Power Maps of Solar Active Regions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-811336