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Astrophysics and Astrononmy
Will ExoMars be the mission to find life on Mars?
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
08.03.2019
Caption:
Will ExoMars be the mission to find life on Mars? Euronews is first to film Airbus' specially-built rover clean room and discuss the freshly-selected landing site with European and Russian experts.
Made by euronews: the most watched news channel in Europe
What can be done about space debris?
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
04.05.2018
Caption:
Made by euronews, the most watched news channel in Europe.
euronews knowledge brings you a fresh mix of the world's most interesting know-hows, directly from space and sci-tech experts.
What's the risk from asteroids, and what's being done about it?
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
02.07.2018
Caption:
made by euronews: the most watched news channel in Europe
Episode I: The QuEST for Sunspots
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
09.09.2020
Caption:
Observing sunspots, Galileo discovered the rotation of the Sun… George Ellery Hale discovered that they have intense magnetic fields…But there are still many open questions about these enigmatic structures. EST will help answer them.
Detection and dynamics of the vortex tubes in the solar atmosphere | Suzana de Souza e Almeida Silva
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
03.03.2021
Caption:
We present the state-of-art detection method of three-dimensional vortices and apply it to realistic magneto-convections simulations performed by the MURaM code. The detected vortices extend from the photosphere to the low chromosphere, presenting similar behaviour at all height levels. The vortices concentrate the magnetic field, and thereby the plasma dynamics inside the vortex is considerably influenced by the Lorentz force. Rotational motions also perturb the magnetic field lines, but they lead to only slightly bent flux tubes as the magnetic field tension is too high for the vortex flow to significantly twist the magnetic lines. We find that twisted magnetic flux tubes are created by shear motions in regions where plasma-beta>1, regardless of the existence of flow vortices.
Polarization signatures during the X1.6 flare observed in active region NOAA 12192 | Fabiana Ferrente
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
12.07.2021
Caption:
The X1.6 flare observed on 22 October 2014 (SOL2014-10-22T14:28) was among the strongest flares that occurred in the magnetically complex, great active region NOAA 12192. Despite the large amount of released energy, it was a confined flare, without an accompanying CME. In our work we attempt to deepen our understanding of the magnetic field configuration of the active region NOAA 12192. We analyzed the polarization signatures during the flare using full spectro-polarimetric data acquired by the IBIS/DST instrument along the photospheric Fe I 617.3 nm and the chromospheric Ca II 854.2 nm lines in a one-hour time interval immediately following the peak of the X1.6 flare. The results obtained provide evidence of significant changes in the magnetic field configuration of the chromosphere durin
Magnetic field inference in spicules and coronal rain clumps | Matheus Aguiar-Kriginsky Silva
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
24.05.2021
Caption:
In this seminar, we aim to present the results of two recent works centred at the use of spectropolarimetric data obtained with the CRISP instrument at the SST in the Ca II 845.2 nm line. With these observations, we obtain information about the magnetic field present in chromospheric spicules and coronal rain clumps. For this purpose, we have used the Weak-field approximation (WFA), which albeit being computationally simple to implement, needs careful assessment of the conditions of the plasma to be correctly applied. Magnetic fields of the order of hundreds of Gauss are inferred. We also combine the Ca II 845.2 nm observations with simultaneous Hα observations to estimate the temperature and non-thermal velocity of the plasma in coronal rain and spicules using the observed Doppler amplitu
Episode IV: The QuEST for Flares
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
10.09.2020
Caption:
The Sun often releases flares, explosive events occurring in the solar atmosphere. They were discovered in England in the nineteenth century by Richard Carrington at Redhill Observatory, south of London.
Collisional ionisation, recombination, and ionisation potential in two-fluid shocks | Ben Snow
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
24.05.2021
Caption:
Shocks are a universal feature of warm plasma environments, such as the lower solar atmosphere and molecular clouds, which consist of both ionised and neutral species. Including partial ionisation leads to the existence of a finite width for shocks, where the ionised and neutral species decouple and recouple. As such, drift velocities exist within the shock that lead to frictional heating between the two species, in addition to adiabatic temperature changes across the shock. The local temperature enhancements within the shock alter the recombination and ionisation rates and hence change the composition of the plasma. We study the role of collisional ionisation and recombination in slow-mode partially ionised shocks. In particular, we incorporate the ionisation potential energy loss and ana
The solar atmosphere as observed through the Mg I b2 line at high spatial resolution | Azaymi Litzi Siu-Tapia
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
03.06.2021
Caption:
The Mg I b2 line at 5173 Å forms over a large range of heights but its core, which forms under conditions of non-local thermodynamic equilibrium, is most sensitive to heights near the temperature minimum, a region of the solar atmosphere that has not been sufficiently explored. The next-generation solar observatories will have access to this spectral line and will allow for multi-line observations to study the different layers of the solar atmosphere simultaneously and with unprecedented polarimetric sensitivity. We will present a morphological classification of the intensity and circular polarization profiles of this spectral line at high-spatial-resolution, using observations from the Swedish 1-m Solar Telescope. We will also discuss the results of the weak field approximation applied to
Large-amplitude oscillations in solar prominences derived from high-resolution simulations | Valeriia Liakh
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
19.05.2021
Caption:
We report 2D MHD simulations of the large-amplitude oscillations (LAOs) in the solar prominences performed with MHD code Mancha. We aim to study the properties of LAOs using high-resolution simulations in a simple 2D magnetic configuration that contains a dipped part. We loaded the dense prominence plasma in the dips region. In order to excite oscillations, we used a perturbation directed along the magnetic field. For the same numerical model, the four spatial resolutions were considered: 240, 120, 60, and 30 km. The longitudinal LAOs (LALOs) are strongly damped even in the high-resolution simulation in the region of the weaker and more curved magnetic field (at the center and bottom of the prominence). At the prominence top, the oscillations have relatively longer damping times. Furthermo
The corrugated umbra model | Vasco Henriques
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
19.05.2021
Caption:
The chromosphere of the umbra of sunspots is a remarkably dynamic layer featuring extremely fine sub-arcsec structure. Such structures appear dark against enveloping umbral flashes, but also bright before or after a flash, other features still are bright throughout. Only recently did we start understanding such fine features and semi-empirical modelling is converging with simulations to provide insight, not only into such fine structure, but also into the umbral flash phenomenon itself. The observational evidence weighs overwhelmingly towards a strong corrugation of the umbra where the material in short dynamic fibrils over-extends in a column of upflowing material while the adjacent areas flash. The delayed small-scale umbral brightenings at the bottom of such columns are an out-of-phase
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