Small-scale topology of solar atmospheric dynamics
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 measur...
Saved in:
Published in | Astronomy and astrophysics (Berlin) Vol. 390; no. 2; pp. 681 - 690 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
EDP Sciences
01.08.2002
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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 $\ion{Ca}{ii}$ 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. |
---|---|
Bibliography: | other:2002A%26A...390..681H ark:/67375/80W-ZMC6NCKJ-T publisher-ID:aah3441 istex:EDC5CC065149CAAE9FD9F0CF5423FFF37F5AF025 |
ISSN: | 0004-6361 1432-0746 |
DOI: | 10.1051/0004-6361:20020636 |