Search Publications
Kinematics of a compression front associated with a Coronal Mass Ejection
Bemporad, A.; Frassati, F.; Susino, R. +1 more
On 2014 November 1st a solar prominence eruption associated with a C2.7 class flare and a type II radio burst resulted in a fast partial halo Coronal Mass Ejection (CME). Images acquired in the extreme UV (EUV) by SDO/AIA and PROBA-2/SWAP, and in white light (WL) by SOHO/LASCO show a bright compression front expanding ahead of the CME. The main go…
A multiwavelength view of a classical T Tauri star CV Cha
Karmakar, Subhajeet; Sharma, Saurabh; Joshi, Arti +3 more
Using long-term optical, ultraviolet (UV) and X-ray data, we present a study of a classical T Tauri star CV Cha. The V -band light curve obtained from the All Sky Automated Survey (ASAS) shows short as well as long-term variability. The short-term variability could be due to rotational modulation of CV Cha. We derive the rotational period of 3.714…
Anomaly Detection Performance Comparison on Anomaly-Detection Based Change Detection on Martian Image Pairs
Muller, J. -P.; Sidiropoulos, P.; Putri, A. R. D.
The surface of Mars has been imaged in visible wavelengths for more than 40 years since the first flyby image taken by Mariner 4 in 1964. With higher resolution from orbit from MOC-NA, HRSC, CTX, THEMIS, and HiRISE, changes can now be observed on high-resolution images from different instruments, including spiders (Piqueux et al., 2003) near the s…
Probabilities of Physical Link Between the Components of the Selected Multiple Systems from WDS Catalog
Protsyuk, Yu. I.; Maigurova, N. V.
Astrometric CCD observations of visual components of double and multiple stars were performed using the RI MAO Axial Meridian Circle (AMC) with new Apogee Alta AI-F8300 CCD camera mounted at the telescope in 2018. Observations were carried out automatically in driftscan mode using a standard R filter. Objects for observational program were selecte…
Investigating the Coronal Mass Ejections associated with DH type-II radio bursts and solar flares during the ascending phase of the solar cycle 24
Nedal, Mohamed; Mahrous, Ayman; Youssef, M. +1 more
We studied a set of 74 CMEs, with shedding the light on the halo-CMEs (HCMEs), that are associated with decametric - hectometric (DH) type-II radio bursts (1-16 MHz) and solar flares during the period 2008-2014. The events were classified into 3 groups (disk, intermediate, and limb events) based on their longitudinal distribution.
We found th…Development and qualification of the Feed-Select Mechanism for the Polarimetric and Helioseismic Imager on-board Solar Orbiter
Hirzberger, Johann; Woch, Joachim; Staub, Jan +5 more
The Solar Orbiter Polarimetric and Helioseismic Imager (SO/PHI) will provide maps of the magnetic vector and of the line-of-sight velocities in the solar photosphere. For reaching its science goals, SO/PHI is equipped with two telescopes: the high resolution channel (HRT) and the full disk channel (FDT). Since both optical channels are fed into a …
η Carinae: Particle acceleration and multimessenger aspects
Walter, R.; Balbo, M.
η Carinae is composed of two very massive stars orbiting each other in 5.5 years. The primary star features the densest known stellar wind, colliding with that expelled by its companion. The wind collision region dissipates energy and accelerates particles up to relativistic energies, producing nonthermal X‑ray and γ‑ray emission detected by Beppo…
Signatures of red-shifted foot points in the quiescent coronal loop system
Rao, Yamini K.; Srivastava, Abhishek K.; Kayshap, Pradeep +1 more
We observed quiescent coronal loops using multi-wavelength observations from the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO) on 13 April 2016. The flows at the foot points of such loop systems are studied using spectral data from the Interface Region Imaging Spectrograph (IRIS). The Doppler velocity distributions…
Image Estimation in the Presence of Irregular Sampling, Noise, and Pointing Jitter
Piazzo, Lorenzo
Subpixel real-time jitter detection algorithm and implementation for polarimetric and helioseismic imager
Volkmer, Reiner; Roma, David; Carmona, Manuel +12 more
The polarimetric and helioseismic imager instrument for the Solar Orbiter mission from the European Space Agency requires a high stability while capturing images, specially for the polarimetric ones. For this reason, an image stabilization system has been included in the instrument. It uses global motion estimation techniques to estimate the jitte…