Zobrazeno 1 - 10
of 221
pro vyhledávání: '"P. Svanda"'
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:
Svanda, Michal, Chmurny, Daniel
Publikováno v:
A&A 690, A8 (2024)
Context: Helioseismic inversions rely largely on sensitivity kernels, 3-D spatial functions describing how do the changes in the solar interior translate into the changes of helioseismic observables. These sensitivity kernels come in most cases from
Externí odkaz:
http://arxiv.org/abs/2407.09196
The relative number of sunspots represents the longest evidence describing the level of solar activity. As such, its use goes beyond solar physics, e.g. towards climate research. The construction of a single representative series is a delicate task w
Externí odkaz:
http://arxiv.org/abs/2211.03332
Autor:
Vybostokova, Tatiana, Svanda, Michal
The induction of electric currents in electric power distribution networks is a well-known effect of Earth-directed eruptive events. Inspired by recent studies showing that the rate of power-grid anomalies may increase after exposure to strong geomag
Externí odkaz:
http://arxiv.org/abs/2208.03813
Autor:
Michal Pokorny, Ivo Vertat, David Panek, Pavel Hazdra, Milan Svanda, Jan Kracek, Milos Mazanek, Jiri Masopust, Pavel Karban
Publikováno v:
IEEE Access, Vol 12, Pp 11458-11469 (2024)
Contemporary beam-forming antenna arrays often use a large number of individual elements, sometimes hundreds or more, to achieve high gain for advanced applications like radar, space communication, and next-gen cellular networks. These arrays are com
Externí odkaz:
https://doaj.org/article/132bf374bdca4c7e9f798d0ff84f9b1a
We investigate the maximum expected magnitudes of the geomagnetically induced currents (GICs) in the Czech transmission power network. We compute a model utilising the Lehtinen-Pirjola method, considering the plane-wave model of the geoelectric field
Externí odkaz:
http://arxiv.org/abs/2112.02438
Publikováno v:
A&A 654, A84 (2021)
The study of solar oscillations (helioseismology) has been a very successful method of researching the Sun. Helioseismology teaches us about the structure and mean properties of the Sun. Together with mid-resolution data, the local properties were un
Externí odkaz:
http://arxiv.org/abs/2108.00872
Downflows on the solar surface are suspected to play a major role in the dynamics of the convection zone. We investigate the existence of the long-lasting downflows whose effects influence the interior of the Sun and the outer layers. We study the se
Externí odkaz:
http://arxiv.org/abs/2103.03077
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