Conveners
Poster Session 8.2
- Ramon Oliver (University of the Balearic Islands)
Since the hint of the existence of an invariable value of the vertical magnetic field (Bver) on umbra-penumbra boundaries in sunspots by Jurčák (2011), many investigations have focused on studying this property. Umbra-penumbra boundaries of stable sunspots are defined by a critical Bver (Jurčák et al. 2018, Schmassmann et al. 2018; Lindner et al. 2020). On the other hand, when an umbra or pore...
We present the analysis of spectropolarimetric data obtained with the CRISP instrument at the SST in the Ca II 845.2 nm line. We used the Weak-field approximation (WFA) to obtain information about the magnetic field present in chromospheric spicules and coronal rain clumps. Albeit being computationally simple to implement, to correctly apply the WFA requires a careful assessment of the...
From more than 60 years of observations, we have known that the inner solar corona has low-density plasma structures called coronal holes (CHs). Since CHs appear to be connected to the sources of high-speed solar wind streams, which in turn are typically linked to geomagnetic storms, their study is of particular relevance in the field of Space Weather.
The connection between the photospheric...
UV compact bursts (CBs) are observed by IRIS in both NUV and FUV channels. They appear as small and intense short lifetime brightenings visible in solar active regions. Some of them can be connected with well-known Ellerman bombs and IRIS bombs.
Our interest in CBs was initiated by the paper published by Grubecka et al. (2016), in which we modelled 5 different selected CBs observed in Mg II...
We simulate transverse oscillations in radiatively cooling coronal loops and forward-model their spectrometer and imaging observations, paying attention to the influence of background emission. The transverse oscillations are driven at one footpoint by a periodic velocity driver. A standing kink wave is subsequently formed and the loop cross-section is deformed due to the Kelvin-Helmholtz...
We present a statistical analysis of power distribution of oscillations in plage of the active region NOAA AR12651, observed jointly with ALMA, IRIS, and AIA. We employ coordinated ALMA Band-6 (1.25 mm) brightness temperature maps, IRIS images in 2796 Å passband, and observations in six AIA passbands (1600 Å, 304 Å, 131 Å, 171 Å, 193 Å, and 211 Å). We study the spatial association of...
The validity of the lambda-meter method for determining the quiet Sun velocity field using the Si I 1082.7 nm line is investigated. To this end, the intensity profiles of this line were calculated for the solar disk center by means of NLTE simulations in a three-dimensional model atmosphere describing the small-scale magnetic activity in the quiet solar photosphere. The velocity field...
