On the nature of umbral oscillations: theory and observation by CDS/SoHO

Details On the nature of umbral oscillations: theory and observation by CDS/SoHO On the nature of umbral oscillations: theory and observation by CDS/SoHO

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..427b&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Sunspot Umbrae: Oscillations, Magneto-Acoustic Waves

Scientific paper

We will present solutions for magneto-acoustic-gravity (or MAG) waves. The possible wave modes in the 3-5 min range will be discussed. We will then present observations of sunspots performed in the EUV wavelength range with the Coronal Diagnostic Spectrometer (CDS) on SoHO. We examine the time series for the line intensities and relative velocities and calculate their power spectrum using wavelet transforms. We find oscillations in the chromosphere and transition region above the sunspots in the temperature range logT = 4.6 -5.4. Most of the spectral power above the umbra is contained in the 5-7 mHz frequency range. When the CDS slit crosses the sunspot plume a clear 3 min oscillation is observed. The observations are interpreted in terms of slow magnetoacoustic waves propagating upwards.

Affiliated with

Also associated with

No associations

Rating

On the nature of umbral oscillations: theory and observation by CDS/SoHO 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 On the nature of umbral oscillations: theory and observation by CDS/SoHO, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the nature of umbral oscillations: theory and observation by CDS/SoHO will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-963847