| Issue |
A&A
Volume 386, Number 2, May I 2002
|
|
|---|---|---|
| Page(s) | 653 - 657 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361:20020279 | |
| Published online | 15 May 2002 | |
Oscillations on the Sun in regions with a vertical magnetic field
I. Sunspot umbral oscillations
Central Astronomical Observatory of Russian Academy of Sciences, 65 Pulkovo, 196 140 St. Petersburg, Russia
Corresponding author: zhukov-spb@mail.ru
Received:
29
August
2001
Accepted:
29
January
2002
We have calculated the spectrum of eigenmodes of umbral oscillations. The eigenmodes of oscillations with periods from several tens of minutes (g-modes) to several tens of seconds (p-modes) have been found. It is shown that the 3-min umbral oscillations are p-modes modified by the magnetic field.
Key words: Sun: sunspots / Sun: oscillations / magnetohydrodynamics (MHD)
© ESO, 2002
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