Doppler Events in the Solar Photosphere: The Coincident Superposition of Fast Granular Flows and p-Mode Coherence Patches

Observations of the solar photosphere show spatially compact large-amplitude Doppler velocity events with short lifetimes. In data from the Imaging Magnetograph eXperiment (IMaX) on the first flight of the Sunrise balloon in 2009, events with velocities in excess of 4 σ from the mean can be identifi...

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Bibliographic Details
Published in:Solar physics 2019-02, Vol.294 (2), p.1-9, Article 18
Main Authors: McClure, R. Lee, Rast, Mark P., Martínez Pillet, Valentin
Format: Article
Language:English
Subjects:
Acoustic waves
Acoustics
Astrophysics and Astroparticles
Atmospheric Sciences
Coherence
Line spectra
Magnetic fields
Paths
Photosphere
Physics
Physics and Astronomy
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Superposition (mathematics)
Time series
Velocity
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Summary:Observations of the solar photosphere show spatially compact large-amplitude Doppler velocity events with short lifetimes. In data from the Imaging Magnetograph eXperiment (IMaX) on the first flight of the Sunrise balloon in 2009, events with velocities in excess of 4 σ from the mean can be identified in both intergranular downflow lanes and granular upflows. We show that the statistics of such events are consistent with the random superposition of strong convective flows and p-mode coherence patches. Such coincident superposition complicates the identification of acoustic wave sources in the solar photosphere, and may be important in the interpretation of spectral line profiles formed in solar photosphere.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-019-1395-9