Conveners
Poster Session 5.5
- Emilia Kilpua (University of Helsinki)
Coronal mass ejections (CMEs) are one of the main factors determining space weather. The results of the study of CMEs, type II radio bursts (RBIIs) and CMEs associated with RBIIs (RBII CMEs) observed from 1995 to 2017 are presented.
DH RBIIs are believed to be generated by magnetohydrodynamic shock waves. CMEs are considered to be the main phenomenon of solar activity, which are the...
We present simultaneous magnetic field measurements for the limb solar flare of 1981 July 17 using of the Ca II K, H$\delta$, He I 4471.5 Å and H$\beta$ lines (Yakovkin et al., 2021; https://doi.org/10.1016/j.asr.2021.03.036). For two moments during the flare, which differ in time by 16 min, we analyzed Stokes $I \pm V$ and $V$ profiles of these lines from observations made on the Echelle...
Radio zebras are detected as narrow-band stripes in radio observations from Sun, Jupiter, and Crab pulsar. They are Type IV radio fine structures and can help with diagnoses of local plasma properties in the active solar regions. The double plasma resonance model of solar radio zebra assumes dense and cold background isotropic plasma and rare hot component with an unstable loss-cone type of...
Using data from SDO/HMI, Hinode/SOT, and LYRA instruments, we study the white-light continuum emission during the X9.3 solar flare (SOL2017-09-06T11:53). Assuming that the emission is due to hydrogen Balmer and Paschen continua, we estimate the temperature evolution during that solar flare.
Coronal dimmings are temporary regions of strongly reduced emission in extreme-ultraviolet (EUV) and soft X-rays caused by expansion and evacuation of plasma associated with coronal mass ejections (CMEs).
We seek to gain insight into observed features of coronal dimmings (location, dynamics, intensity distribution) as they relate to magnetic reconnection due to the associated flare. We...
The Nancay Radioheliograph is dedicated to imaging the solar corona at decimetre-to-metre wavelengths. The imaged structures are the quiet corona, through thermal bremsstrahlung, and bright collective emissions due to electrons accelerated in quiescent, flaring and eruptive active regions. After more than five years of interruption for an instrument upgrade, solar observations were resumed in...
We present the observations of two type III solar radio events performed with LOFAR (LOw-Frequency ARray) station in Bałdy (PL612), Poland in single mode. The first event occurred on 20th August 2017 and the second one on 9th September 2017. Solar dynamic spectra were recorded in the 10 MHz up to 90 MHz frequency band. Together with the wide frequency bandwidth LOFAR telescope (with single...
