Time-Series Analysis of Supergranule Characteristics Derived from SOHO/MDI Dopplergrams.

Details Time-Series Analysis of Supergranule Characteristics Derived from SOHO/MDI Dopplergrams. Time-Series Analysis of Supergranule Characteristics Derived from SOHO/MDI Dopplergrams.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1725w&link_type=abstract

American Astronomical Society, SPD meeting #42, #17.25; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Supergranulation exhibits both radial and horizontal velocity components within Doppler data. The weak, radial flows drag magnetic field lines to the surface while their strong, divergent, horizontal counterparts advect the field to the edges of the supergranulation cells. Field congregation at supergranule boundaries is observed in magnetic filed images and via Ca II K observations of the chromospheric network.
Supergranulation characteristics, such as typical sizes and velocities, have been studied using MDI Doppler data and tracked over 60-days of observations made in 1996 and 2008, relating to periods of solar minimum. Time-series of these characteristics exhibit regular fluctuations on the order of 3-5 days. These time-series are analyzed to extract frequency information and cross-correlated to investigate any temporal link between the characteristics.
Whether the fluctuations are an instrumental artifact is studied by comparing contemporaneous time series produced from SOHO/MDI and SDO/HMI Dopplergrams. There exists a high correlation between the two time-series showing that the fluctuations are solar in origin.

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