Small-scale topology of solar atmospheric dynamics. V. Acoustic events and internetwork grains

Details Small-scale topology of solar atmospheric dynamics. V. Acoustic events and internetwork grains Small-scale topology of solar atmospheric dynamics. V. Acoustic events and internetwork grains

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...390..681h&link_type=abstract

Astronomy and Astrophysics, v.390, p.681-690 (2002)

Astronomy and Astrophysics

Astrophysics

20

Sun: Photosphere, Sun: Chromosphere, Sun: Oscillations

Scientific paper

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 \CaII \KtwoV 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.

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