55 citations · 176 across the 6 of their papers we have counts for
5 papers · 1 filter
Convective blueshifts in the solar atmosphere: III. High-accuracy observations of spectral lines in the visible
Johannes Löhner-Böttcher, Wolfgang Schmidt, Rolf Schlichenmaier +2
Convective motions in the solar atmosphere cause spectral lines to become asymmetric and shifted in wavelength. For photospheric lines, this differential Doppler shift varies from…
Convective blueshifts in the solar atmosphere II. High-accuracy observations of the Fe i 6173.3Å line and deviations of full-disk Dopplergrams
Franziska Stief, Johannes Löhner-Böttcher, Wolfgang Schmidt +2
Granular convective motions reach into the lower solar atmosphere, typically causing photospheric spectral lines to exhibit a differential line shift. This Doppler shift to shorter…
Convective blueshifts in the solar atmosphere, I. Absolute measurements with LARS of the spectral lines at 6302 Å
Johannes Löhner-Böttcher, Wolfgang Schmidt, Franziska Stief +2
The solar convection manifests as granulation and intergranulation at the solar surface. In the photosphere, convective motions induce differential Doppler shifts to spectral lines…
Signatures of running penumbral waves in sunspot photospheres
Johannes Löhner-Böttcher, Nazaret Bello González
The highly dynamic atmosphere above sunspots exhibits a wealth of magnetohydrodynamic (MHD) waves. Recent studies suggest a coupled nature of the most prominent phenomena: umbral f…
Correlations between sunspots and their moat flows
Johannes Löhner-Böttcher, Rolf Schlichenmaier
Context. The presence of the moat flow around sunspots is intimately linked to the mere existence of sunspots. Aims. We characterize the moat flow (MF) and Evershed flow (EF) in su…