Umbral oscillations and penumbral waves in H alpha

Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

16

H Alpha Line, Penumbras, Sunspots, Umbras, Wave Propagation, Filtergrams, Oscillations, Solar Atmosphere, Solar Magnetic Field, Solar Spectra, Spectroheliographs, Velocity Distribution

Scientific paper

Examples are presented of umbral oscillations observed on Big Bear H-alpha filtergram movies, and the relation between umbral oscillations and running penumbral waves occurring in the same sunspot is investigated. Umbral oscillations near the center of the umbra are probably physically independent of the penumbral waves because the period of these umbral oscillations (150 sec) is shorter than the penumbral wave period (270 sec), but not a harmonic. Dark puffs emerge from the edge of the umbra and move outward across the penumbra, and have the same period as the running penumbral waves. These dark puffs are interpreted to be the extension of chromospheric umbral oscillations at the edge of the umbra. It is suggested that the dark puffs and the running penumbral waves have a common source: photospheric oscillations just inside the umbra.

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

Umbral oscillations and penumbral waves in H alpha 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 Umbral oscillations and penumbral waves in H alpha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Umbral oscillations and penumbral waves in H alpha will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1522909

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