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Reflection of the strahl within the foot of the Earth's bow shock
Goldstein, Melvyn L.; Gurgiolo, Christopher A.; Viñas, Adolfo
The reflection of a fraction of the solar wind at the bow shock to some extent defines the physical properties of what is known as the foreshock, the region where the interplanetary magnetic field has a direct connection to the bow shock. Both ion and electron reflection have been observed and together form a significant source of free energy that…
V348 And and V572 Per: Bright Triple Systems with Eccentric Eclipsing Binaries
Wolf, M.; Uhlař, R.; Zasche, P. +5 more
The eclipsing binaries are still important objects for our understanding of the universe. Especially these ones located within the more complex multiple systems can help us solving the problem of their origin and subsequent evolution of these higher order multiples. Photometry and spectroscopy spanning over more than 25 yr were used for the first …
Correlation Between Graben Orientation, Channel Direction Change, and Tectonic Loading: The Elysium Province, Mars
Kneller, B. D.; Roberts, G. P.; Grindrod, P. M.
We have investigated the links between regional stress fields, the volcanic centers, rifts, graben, and channels in the NW region of the Elysium Province (Figures a and b) to determine whether the sequence of stress events occurring during province development can be derived from the morphologies of these features, and thus provide a sequence of d…
Velocity Structure and Temperature Dependence of an Extreme-Ultraviolet Jet Observed by Hinode
Imada, S.; Kawai, T.; Kanda, N.
The acceleration mechanism of EUV and X-ray jets is still unclear. In general, there are two candidates for the mechanism. One is magnetic reconnection, and the other is chromospheric evaporation. We observed a relatively compact X-ray jet that occurred between 10:50 - 11:10 UT on 18 February 2011 by using the Solar Dynamics Observatory/Atmospheri…
Validation of a temperate fourth planet in the K2-133 multiplanet system
Poppenhaeger, K.; Wells, R.; Watson, C. A.
We present follow-up observations of the K2-133 multiplanet system. Previously, we announced that K2-133 contained three super-Earths orbiting an M1.5V host star - with tentative evidence of a fourth outer-planet orbiting at the edge of the temperate zone. Here, we report on the validation of the presence of the fourth planet, determining a radius…
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…