Issue |
A&A
Volume 390, Number 2, August I 2002
|
|
---|---|---|
Page(s) | 681 - 690 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361:20020636 | |
Published online | 12 July 2002 |
Small-scale topology of solar atmospheric dynamics
V. Acoustic events and internetwork grains
1
Max Planck Institut für Aeronomie, Max Planck Strasse 2, 37191 Katlenburg-Lindau, Germany e-mail: hoekzema@linmpi.mpg.de
2
National Solar Observatory/Sacramento Peak, PO Box 62, Sunspot, NM 88349-0062, USA e-mail: rimmele@sunspot.noao.edu
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
Received:
22
January
2002
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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