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Autor:
González, M. J. Mart\' inez, Yabar, A. Pastor, Lagg, A., Ramos, A. Asensio, Collados, M., Solanki, S. K., Balthasar, H., Berkefeld, T., Denker, C., Doerr, H. P., Feller, A., Franz, M., Manrique, S. J. Gonzaález, Hofmann, A., Kneer, F., Kuckein, C., Louis, R., von der Luühe, O., Nicklas, H., Orozco, D., Rezaei, R., Schlichenmaier, R., Schmidt, D., Schmidt, W., Sigwarth, M., Sobotka, M., Soltau, D., Staude, J., Strassmeier, K. G., Verma, M., Waldman, T., Volkmer, R.
We present high-precision spectro-polarimetric data with high spatial resolution (0.4$''$) of the very quiet Sun at 1.56$\mu$m obtained with the GREGOR telescope to shed some light on this complex magnetism. Half of our observed quiet-Sun region is b
Externí odkaz:
http://arxiv.org/abs/1804.10089
Autor:
Löhner-Böttcher, J., Schmidt, W., Schlichenmaier, R., Doerr, H. -P., Steinmetz, T., Holzwarth, R.
Publikováno v:
A&A 617, A19 (2018)
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 Doppl
Externí odkaz:
http://arxiv.org/abs/1804.08304
Autor:
Loehner-Boettcher, J., Schmidt, W., Doerr, H. -P., Kentischer, T., Steinmetz, T., Probst, R. A., Holzwarth, R.
Publikováno v:
A&A 607, A12 (2017)
LARS is an Absolute Reference Spectrograph designed for ultra-precise solar observations. The high-resolution echelle spectrograph of the Vacuum Tower Telescope is supported by a state-of-the-art laser frequency comb to calibrate the solar spectrum o
Externí odkaz:
http://arxiv.org/abs/1707.01573
Autor:
Solanki, S. K., Riethmüller, T. L., Barthol, P., Danilovic, S., Deutsch, W., Doerr, H. P., Feller, A., Gandorfer, A., Germerott, D., Gizon, L., Grauf, B., Heerlein, K., Hirzberger, J., Kolleck, M., Lagg, A., Meller, R., Tomasch, G., van Noort, M., Rodríguez, J. Blanco, Blesa, J. L. Gasent, Jiménez, M. Balaguer, Iniesta, J. C. Del Toro, Jiménez, A. C. López, Suárez, D. Orozco, Berkefeld, T., Halbgewachs, C., Schmidt, W., Álvarez-Herrero, A., Sabau-Graziati, L., Grande, I. Pérez, Pillet, V. Martínez, Card, G., Centeno, R., Knölker, M., Lecinski, A.
The SUNRISE balloon-borne solar observatory, consisting of a 1~m aperture telescope that provided a stabilized image to a UV filter imager and an imaging vector polarimeter, carried out its second science flight in June 2013. It provided observations
Externí odkaz:
http://arxiv.org/abs/1701.01555
Autor:
Lagg, A., Solanki, S. K., Doerr, H. -P., González, M. J. Martínez, Riethmüller, T., Vera, M. Collados, Schlichenmaier, R., Suárez, D. Orozco, Franz, M., Feller, A., Kuckein, C., Schmidt, W., Ramos, A. Asensio, Yabar, A. Pastor, von der Lühe, O., Denker, C., Balthasar, H., Volkmer, R., Staude, J., Hofmann, A., Strassmeier, K., Kneer, F., Waldmann, T., Borrero, J. M., Sobotka, M., Verma, M., Louis, R. E., Rezaei, R., Soltau, D., Berkefeld, T., Sigwarth, M., Schmidt, D., Kiess, C., Nicklas, H.
Publikováno v:
A&A 596, A6 (2016)
Context. Investigations of the magnetism of the quiet Sun are hindered by extremely weak polarization signals in Fraunhofer spectral lines. Photon noise, straylight, and the systematically different sensitivity of the Zeeman effect to longitudinal an
Externí odkaz:
http://arxiv.org/abs/1605.06324
Publikováno v:
A&A 590, A118 (2016)
Context: The high-fidelity solar spectral atlas prepared by Delbouille and co-workers (Li\`ege atlas), and the one by Neckel and co-workers (Hamburg atlas), are widely recognised as the most important reference spectra of the Sun at disc-centre in th
Externí odkaz:
http://arxiv.org/abs/1604.03748
Autor:
Caffau, E., Ludwig, H. -G., Steffen, M., Livingston, W., Bonifacio, P., Malherbe, J. -M., Doerr, H. -P., Schmidt, W.
The solar photospheric abundance of oxygen is still a matter of debate. For about ten years some determinations have favoured a low oxygen abundance which is at variance with the value inferred by helioseismology. Among the oxygen abundance indicator
Externí odkaz:
http://arxiv.org/abs/1506.00931
Autor:
Probst, R A, Wang, L, Doerr, H-P, Steinmetz, T, Kentischer, T J, Zhao, G, Hänsch, T W, Udem, Th, Holzwarth, R, Schmidt, W
Publikováno v:
New J. Phys. 17, 023048 (2015)
We investigate a new scheme for astronomical spectrograph calibration using the laser frequency comb at the Solar Vacuum Tower Telescope on Tenerife. Our concept is based upon a single-mode fiber channel, that simultaneously feeds the spectrograph wi
Externí odkaz:
http://arxiv.org/abs/1502.04942
A wavelength calibration system based on a laser frequency comb (LFC) was developed in a co-operation between the Kiepenheuer-Institut f\"ur Sonnenphysik, Freiburg, Germany and the Max-Planck-Institut f\"ur Quantenoptik, Garching, Germany for permane
Externí odkaz:
http://arxiv.org/abs/1204.0948