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Selected phenomena that affect the structure of the cometary landscape
Wesołowski, M.
The paper discusses four processes that may be responsible for shaping the relief of the comet landscape. The considerations take into account the following phenomena: intense sublimation of cometary ice, emission of dust from the surface comet and through jets, migration of dust on the cometary surface, and destruction of fragment the nucleus sur…
Absolute parameters of the W UMa binaries CSS J223614+311343, V523 Aur and V783 And
Michel, Raul; Kjurkchieva, Diana; Popov, Velimir A. +3 more
Photometric BVRc observations of the stars CSS J223614+311343, V523 Aur and V783 And were carried out and their absolute parameters (masses, radii and luminosities) were determined based on light curve modeling and Gaia distances. The main results are: (i) The components of CSS J223614+311343 and V783 And are of K spectral type while th…
Evidence for local particle acceleration in the first recurrent galactic cosmic ray depression observed by Solar Orbiter. The ion event on 19 June 2020
Fedorov, A.; Kulkarni, S. R.; Lario, D. +61 more
Context. In mid-June 2020, the Solar Orbiter (SolO) mission reached its first perihelion at 0.51 au and started its cruise phase, with most of the in situ instruments operating continuously.
Aims: We present the in situ particle measurements of the first proton event observed after the first perihelion obtained by the Energetic Particle Detec…
Using Observations of Solar Vector Magnetic Field from Dual View Points to Remove the 180∘ Ambiguity
Liu, Rui; Zhou, Ru-yun; Wang, Yu-ming +3 more
With Solar Orbiter (SO) being put into successful operational observation, solar magnetic observation has entered the era of remote sensing from dual view points. In this paper, we carried out a simulation of correcting the 180∘ ambiguity of transverse magnetic field with magnetograms from dual view points using an analytical formula as…
BVR photometric study and absolute parameters of the eclipsing binary AG LMi
Ebadi, H.; Mousavi-Sadr, M.
We present the CCD observations and light and radial velocity curves analysis for the eclipsing binary system AG LMi. Three minimum times of light curves were determined and used to calculate the orbital period's value as 1.3590 ±0.0001 days and a new epoch of the system as 2458141.2040 ±0.0002 days. The observed B, V, and R light curves and radia…
Lower Surface Temperature at Bright Ephemeral Feature Site on Titan's North Pole
Barnes, Jason W.; Dhingra, Rajani D.; Cottini, Valeria +1 more
We report a temperature difference in one of the regions on Titan that is, documented as a bright ephemeral feature (BEF). Spectra were recorded by Cassini's Composite Infrared Spectrometer. BEFs are 5 µm bright areas that appear, disappear, and shift from flyby to flyby at Titan's North Pole observed in Visual and Infrared Mapping Spectrometer (V…
A small radio galaxy at z = 4.026
Paragi, Zsolt; Krezinger, Máté; Frey, Sándor +8 more
Less than $200$ radio-loud active galactic nuclei (AGN) are known above redshift $4$. Around $40$ of them have been observed at milliarcsecond (mas) scale resolution with very long baseline interferometry (VLBI) technique. Some of them are unresolved, compact, relativistically beamed objects, blazars with jets pointing at small angles to the obser…
Imprints of the secondary interstellar hydrogen atoms at 1 AU
Katushkina, O. A.; Izmodenov, V. V.; Alexashov, D. B. +1 more
In this paper, we search for the possible imprints of the secondary interstellar hydrogen atoms created at the heliospheric boundary in the full-sky maps of the hydrogen fluxes at the Earth orbit. By using our three-dimensional time-dependent kinetic model, the maps of the hydrogen fluxes are calculated for different phases of the solar cycle and …
Orbital and sub-orbital period determination of the candidate high-mass X-ray binary HD 3191
Luque-Escamilla, Pedro L.; Martí, Josep; Paredes, Josep M. +1 more
Aims: The final aim of this paper is to expand the sparse group of X-ray binaries with gamma-ray counterparts as laboratories to study high-energy processes under physical conditions that periodically repeat.
Methods: A follow-up of a candidate system has been carried out. We applied both photometric and spectroscopic techniques in the o…
A New Concept to Measure the Ambipolar Electric Field Driving Ionospheric Outflow
Li, Kun; Wei, Yong; Haaland, Stein
Over the last few decades, the role of ionospheric outflow for the loss of atmospheric constituents, as a plasma supplier to the magnetosphere and hence for the evolution of the Earth's atmosphere has been recognized. A substantial amount of the outflow is thought to be caused by the presence of an ambipolar electric field aligned with the open ma…