Zobrazeno 1 - 10
of 719
pro vyhledávání: '"Sobotka M"'
Autor:
García-Rivas, M., Kašparová, J., Berlicki, A., Švanda, M., Dudík, J., Čtvrtečka, D., Zapiór, M., Liu, W., Sobotka, M., Pavelková, M., Motorina, G. G.
Context: On 2022 May 4, an M5.7 flare erupted in the active region NOAA 13004, which was the target of a coordinated campaign between GREGOR, IRIS, Hinode, and ground-based instruments at the Ond\v{r}ejov observatory. A flare kernel located at the ed
Externí odkaz:
http://arxiv.org/abs/2408.10813
Autor:
Kuckein, C., Balthasar, H., Noda, C. Quintero, Diercke, A., Arjona, J. C. Trelles, Cobo, B. Ruiz, Felipe, T., Denker, C., Verma, M., Kontogiannis, I., Sobotka, M.
Publikováno v:
A&A 653, A165 (2021)
The spectral window, containing Fraunhofer lines formed in the solar photosphere, around the magnetically sensitive Cr I lines at 5780.9, 5781.1, 5781.7, 5783.0, and 5783.8 \r{A}, with Land\'e g-factors between 1.6 and 2.5, is explored. The goal is t
Externí odkaz:
http://arxiv.org/abs/2107.11116
Publikováno v:
A&A 648, A28 (2021)
Aims: To study the heating of solar chromospheric magnetic and nonmagnetic regions by acoustic and magnetoacoustic waves, the deposited acoustic-energy flux derived from observations of strong chromospheric lines is compared with the total integrated
Externí odkaz:
http://arxiv.org/abs/2102.08678
Publikováno v:
A&A 647, A146 (2021)
Context: The evolution of solar active regions is still not fully understood. The growth and decay of active regions have mostly been studied in case-by-case studies. Aims: Instead of studying the evolution of active regions case by case, we performe
Externí odkaz:
http://arxiv.org/abs/2102.02807
Autor:
Abbasvand, V., Sobotka, M., Švanda, M., Heinzel, P., Rivas, Marta García, Denker, C., Balthasar, H., Verma, M., Kontogiannis, I., Koza, J., Korda, D., Kuckein, C.
Publikováno v:
A&A 642, A52 (2020)
Aims. To investigate the role of acoustic and magneto-acoustic waves in heating the solar chromosphere, observations in strong chromospheric lines are analyzed by comparing the deposited acoustic-energy flux with the total integrated radiative losses
Externí odkaz:
http://arxiv.org/abs/2008.02688
Autor:
Verma, M., Denker, C., Diercke, A., Kuckein, C., Balthasar, H., Dineva, E., Kontogiannis, I., Pal, P. S., Sobotka, M.
Publikováno v:
A&A 639, A19 (2020)
High-spectral resolution observations using the VTT echelle spectrograph in the chromospheric H$\alpha$ line were obtained in the early growth phase of active region NOAA 12722. Noise-stripped H$\alpha$ line profiles yield maps of line-core and bisec
Externí odkaz:
http://arxiv.org/abs/2005.03966
Autor:
Verma, M., Balthasar, H., Denker, C., Böhm, F., Fischer, C. E., Kuckein, C., Manrique, S. J. González, Sobotka, M., González, N. Bello, Diercke, A., Berkefeld, T., Collados, M., Feller, A., Hofmann, A., Lagg, A., Nicklas, H., Suárez, D. Orozco, Yabar, A. Pastor, Rezaei, R., Schlichenmaier, R., Schmidt, D., Schmidt, W., Sigwarth, M., Solanki, S. K., Soltau, D., Staude, J., Strassmeier, K. G., Volkmer, R., von der Lühe, O., Waldmann, T.
The solar magnetic field is responsible for all aspects of solar activity. Sunspots are the main manifestation of the ensuing solar activity. Combining high-resolution and synoptic observations has the ambition to provide a comprehensive description
Externí odkaz:
http://arxiv.org/abs/1805.07752
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:
Balthasar, H., Gömöry, P., Manrique, S. J. González, Kuckein, C., Kučera, A., Schwartz, P., Berkefeld, T., Collados, M., Denker, C., Feller, A., Hofmann, A., Schmidt, D., Schmidt, W., Sobotka, M., Solanki, S. K., Soltau, D., Staude, J., Strassmeier, K. G., von der Lühe, O.
We observed an arch filament system (AFS) in a sunspot group with the GREGOR Infrared Spectrograph attached to the GREGOR solar telescope. The AFS was located between the leading sunspot of negative polarity and several pores of positive polarity for
Externí odkaz:
http://arxiv.org/abs/1804.01789
Autor:
Verma, M., Denker, C., Balthasar, H., Kuckein, C., Rezaei, R., Sobotka, M., Deng, N., Wang, H., Tritschler, A., Collados, M., Diercke, A., Manrique, S. J. González
Publikováno v:
A&A 614, A2 (2018)
Combining high-resolution spectropolarimetric and imaging data is key to understanding the decay process of sunspots as it allows us scrutinizing the velocity and magnetic fields of sunspots and their surroundings. Active region NOAA 12597 was observ
Externí odkaz:
http://arxiv.org/abs/1801.03686