Three-Dimensional Structure of Evershed Flows

Details Three-Dimensional Structure of Evershed Flows Three-Dimensional Structure of Evershed Flows

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9506d&link_type=abstract

American Astronomical Society Meeting 210, #95.06; Bulletin of the American Astronomical Society, Vol. 39, p.224

Astronomy and Astrophysics

Astronomy

Scientific paper

The Evershed flow is known as the unceasing radially outward mass flow in sunspot penumbrae observed in the photosphere, which is most clearly seen near the solar limb. The Evershed flow reverses its direction in the chromosphere, where an inward mass flow is observed. In order to quantitatively explore the three-dimensional structure of the Evershed flow from photosphere to chromosphere, we observed a sunspot group (NOAA 10892) at the limb using the Horizontal Spectrograph (HSG) at the National Solar Observatory/Sacramento Peak (NSO/SP) on 2006 June 04. Spectral data sets were obtained simultaneously at four solar absorbtion lines: Fe 630.15 nm and 630.25 nm (photosphere), NaD 588.99 nm (lower chromosphere), and Hα 656.28 nm (chromosphere). Spectral analysis and different methods of determining Doppler velocities will be presented and compared.
This work is supported by NSF under grant ATM 02-36945, ATM 03-42560, ATM 05-48260 and MRI AST 00-79482 and by NASA under grant NAG 5-13661.

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