Absolute velocity measurements in sunspot umbrae

Context. In sunspot umbrae, convection is largely suppressed by the strong magnetic field. Previous measurements reported on negligible convective flows in umbral cores. Based on this, numerous studies have taken the umbra as zero reference to calculate Doppler velocities of the ambient active regio...

Ausführliche Beschreibung

Bibliographische Detailangaben

Veröffentlicht in:	Astronomy and astrophysics (Berlin) 2018-09, Vol.617, p.A19
Hauptverfasser:	Löhner-Böttcher, J., Schmidt, W., Schlichenmaier, R., Doerr, H.-P., Steinmetz, T., Holzwarth, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Calibration Convection Field strength Line spectra Magnetic fields Mathematical analysis methods: observational Photosphere Solar magnetic field Sun Sun: atmosphere Sun: fundamental parameters Sunspots techniques: spectroscopic Velocity
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!