Zobrazeno 1 - 10
of 310
pro vyhledávání: '"van der Voort, L."'
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
When interpreting spectropolarimetric observations of the solar atmosphere, wavelength variations of the emergent intensity and polarization translate into information on the depth stratification of physical parameters. We aim to quantify how the inf
Externí odkaz:
http://arxiv.org/abs/2409.13677
Autor:
Baso, C. J. Díaz, Ramos, A. Asensio, Rodríguez, J. de la Cruz, Santos, J. M. da Silva, van der Voort, L. Rouppe
Full-Stokes polarimetric datasets, originating from slit-spectrograph or narrow-band filtergrams, are routinely acquired nowadays. The data rate is increasing with the advent of bi-dimensional spectropolarimeters and observing techniques that allow l
Externí odkaz:
http://arxiv.org/abs/2409.05156
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
Magnetic reconnection in the deep solar atmosphere can give rise to enhanced emission in the Balmer hydrogen lines, a phenomenon known as Ellerman bombs (EBs). It is most common to observe EBs in the H-alpha and H-beta lines. High quality shorter wav
Externí odkaz:
http://arxiv.org/abs/2401.12077
Autor:
Nóbrega-Siverio, D., Moreno-Insertis, F., Galsgaard, K, Krikova, K., van der Voort, L. Rouppe, Joshi, R., Madjarska, M. S.
The solar atmosphere is filled with clusters of hot small-scale loops commonly known as Coronal Bright Points (CBPs). These ubiquitous structures stand out in the Sun by their strong X-ray and/or extreme-ultraviolet (EUV) emission for hours to days,
Externí odkaz:
http://arxiv.org/abs/2311.11912
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
Publikováno v:
A&A 675, A103 (2023)
Nanoflare heating through small-scale magnetic reconnection events is one of the prime candidates to explain heating of the solar corona. However, direct signatures of nanoflares are difficult to determine, and unambiguous observational evidence is s
Externí odkaz:
http://arxiv.org/abs/2306.02752
Autor:
Murabito, M., Ermolli, I., Chatzistergos, T., Jafarzadeh, S., Giorgi, F., van der Voort, L. Rouppe
Publikováno v:
ApJ 947, 18 (2023)
We analysed state-of-the-art observations of the solar atmosphere to investigate the dependence of the \ca brightness of several solar features on spectral bandwidth and spatial resolution of the data. Specifically, we study data obtained at the Swed
Externí odkaz:
http://arxiv.org/abs/2303.17160