Volume 390, Number 2, August I 2002
|Page(s)||681 - 690|
|Section||Planets and planetary systems|
|Published online||12 July 2002|
Small-scale topology of solar atmospheric dynamics
V. Acoustic events and internetwork grains
Max Planck Institut für Aeronomie, Max Planck Strasse 2, 37191 Katlenburg-Lindau, Germany e-mail: email@example.com
2 National Solar Observatory/Sacramento Peak, PO Box 62, Sunspot, NM 88349-0062, USA e-mail: firstname.lastname@example.org
3 Sterrekundig Instituut, Postbus 80 000, 3508 TA Utrecht, The Netherlands e-mail: R.J.Rutten@astro.uu.nl
Corresponding author: R. J. Rutten, R.J.Rutten@astro.uu.nl
Accepted: 22 April 2002
We use high-quality observations from the Dunn Solar Telescope at NSO/Sacramento Peak to study spatio-temporal co-location of acoustic flux events in the photosphere and internetwork grains in the chromosphere. The events are diagnosed as sites with excess upward-propagating five-minute waves measured from Dopplergrams. The grains are repetitive bright internetwork features in simultaneous K2V filtergrams. We find that the largest-flux sites in the granulation have appreciably larger than random probability to co-locate with exceptionally bright chromospheric internetwork grains, at an average delay of about two minutes which is likely to represent sound travel time to the chromosphere. This finding strengthens the case for acoustic grain excitation.
Key words: Sun: photosphere / Sun: chromosphere / Sun: oscillations
© ESO, 2002
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