Zobrazeno 1 - 10
of 617
pro vyhledávání: '"van der Voort, L. H."'
Publikováno v:
ApJ 976 134 (2024)
Poynting flux generated by random shuffling of photospheric magnetic footpoints is transferred through the upper atmosphere of the Sun where the plasma is heated to over 1 MK in the corona. High spatiotemporal resolution observations of the lower atm
Externí odkaz:
http://arxiv.org/abs/2410.04964
Autor:
Nóbrega-Siverio, D., Cabello, I., Bose, S., van der Voort, L. H. M. Rouppe, Joshi, R., Froment, C., Henriques, V. M. J.
Publikováno v:
A&A 686, A218 (2024)
Advancements in instrumentation have revealed a multitude of small-scale EUV events in the solar atmosphere. Our aim is to employ high-resolution magnetograms to gain a detailed understanding of the magnetic origin of such phenomena. We have used coo
Externí odkaz:
http://arxiv.org/abs/2403.11652
The S-index is a measure of emission in the CaII H & K lines and is a widely used proxy of stellar magnetic activity. It has been assumed until now that the S-index is mainly affected by bright plage regions in the chromosphere. In particular, the ef
Externí odkaz:
http://arxiv.org/abs/2309.03690
Publikováno v:
A&A 677, A52 (2023)
Aims. We aim to understand how Hepsilon is formed in the quiet Sun. In particular, we consider the particular physical mechanism that sets its source function and extinction, how it is formed in different solar structures, and why it is sometimes obs
Externí odkaz:
http://arxiv.org/abs/2307.11131
Autor:
Murabito, M., Guglielmino, S. L., Ermolli, I., Romano, P., Jafarzadeh, S., van der Voort, L. H. M. Rouppe
Publikováno v:
A&A 653, A93 (2021)
The physical conditions leading the sunspot penumbra decay are poorly understood so far. We investigate the photospheric magnetic and velocity properties of a sunspot penumbra during the decay phase to advance the current knowledge of the conditions
Externí odkaz:
http://arxiv.org/abs/2106.04936
Publikováno v:
A&A 648, A54 (2021)
Ellerman bombs are regions with enhanced Balmer line wing emission and mark magnetic reconnection in the deep solar atmosphere in active regions and quiet Sun. They are often found in regions where opposite magnetic polarities are in close proximity.
Externí odkaz:
http://arxiv.org/abs/2101.11321
Autor:
van der Voort, L. H. M. Rouppe, De Pontieu, B., Carlsson, M., Rodriguez, J. de la Cruz, Bose, S., Chintzoglou, G., Drews, A., Froment, C., Gosic, M., Graham, D. R., Hansteen, V. H., Henriques, V. M. J., Jafarzadeh, S., Joshi, J., Kleint, L., Kohutova, P., Leifsen, T., Martinez-Sykora, J., Nobrega-Siverio, D., Ortiz, A., Pereira, T. M. D., Popovas, A., Noda, C. Quintero, Dalda, A. Sainz, Scharmer, G. B., Schmit, D., Scullion, E., Skogsrud, H., Szydlarski, M., Timmons, R., Vissers, G. J. M., Woods, M. M., Zacharias, P.
Publikováno v:
A&A 641, A146 (2020)
NASA's Interface Region Imaging Spectrograph (IRIS) provides high resolution observations of the solar atmosphere through UV spectroscopy and imaging. Since the launch of IRIS in June 2013, we have conducted systematic observation campaigns in coordi
Externí odkaz:
http://arxiv.org/abs/2005.14175
Publikováno v:
A&A 633, A11 (2020)
Thermal non-equilibrium (TNE) is a phenomenon that can occur in solar coronal loops when the heating is quasi-constant and highly-stratified. Under such heating conditions, coronal loops undergo cycles of evaporation and condensation. The recent obse
Externí odkaz:
http://arxiv.org/abs/1911.09710
Autor:
Vissers, G. J. M., Rodriguez, J. de la Cruz, Libbrecht, T., van der Voort, L. H. M. Rouppe, Scharmer, G. B., Carlsson, M.
Publikováno v:
A&A 627, A101 (2019)
Ellerman bombs and UV bursts are transient brightenings that are ubiquitously observed in the lower atmospheres of active and emerging flux regions. Here we present inversion results of SST/CRISP and CHROMIS, as well as IRIS data of such transient ev
Externí odkaz:
http://arxiv.org/abs/1905.02035
Publikováno v:
A&A 597, A138 (2017)
The solar chromosphere observed in H-alpha consists mostly of narrow fibrils. The longest typically originate in network or plage and arch far over adjacent internetwork. We use data from multiple telescopes to analyze one well-observed example in a
Externí odkaz:
http://arxiv.org/abs/1609.07616