Search Publications
Similarities and Differences of SARs in Solar Cycle 24
Li, Ting; Wang, Jingxiu; Chen, Anqin
Solar Cycle 24 is a particularly weak cycle and there are only six super active regions (SARs). Except for NOAA active region (AR) 12192, all other SARs are coronal mass ejection rich (CME-rich) and produced CMEs faster than 1000 kms−1. By studying the similarities and differences between CME-poor SARs and CME-rich SARs in Solar Cycle 2…
First Byurakan Spectral Survey. Late-Type Stars. Dwarfs
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +5 more
A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBS LTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectral plates. A systematic search and selection were carried out on a surface of ∼16 000 deg^2 on almost the whole area of the FBS. Since 2007, all FBS low-resolution spectral plates have…
X-ray characterisation of the massive galaxy cluster ClG J104803.7+313843 at z = 0.76 with XMM-Newton
Rossetti, M.; Bartalucci, I.; Molendi, S. +6 more
We present the characterisation of the massive cluster ClG J104803.7+313843 at z = 0.76 performed using a serendipitous XMM-Newton observation. High redshift and massive objects represent an ideal laboratory to benchmark our understanding of how clusters form and assembly formation is mainly driven by gravity. Leveraging the high throughput of XMM…
X-ray investigation of the X-ray source 1RXS J121902.7-630910 with Suzaku
Bakis, Hicran; Raycheva, Nergis C.; Sezer, Aytap +1 more
We present a study of the unidentified X-ray source 1RXS J121902.7-630910 based on Suzaku X-ray Imaging Spectrometer observation. We aim at clarifying the nature of the emission from 1RXS J121902.7-630910. We found that the spectrum is well represented by a thermal plasma model with an electron temperature of kTe ∼ 3.7 keV, the upper li…
Galactic cosmic ray transport in inner heliosphere: Study with ion chamber and neutron monitor data for 1936-2006
Modzelewska, R.; Ahluwalia, H. S.; Gololobov, P. Yu.
Galactic cosmic ray (GCR) solar diurnal variation data recorded by shielded ion chambers at Cheltenham/Fredericksburg (CH-IC) and Yakutsk (Yak-IC) are corrected for diurnal temperature variation in upper atmosphere and used to calculate the ratio α of GCR free paths normal (λ⊥) and parallel (λ||) to mean interplanetary magnetic field (I…
Solar Photospheric Magnetic Fields, Coronal Mass Ejections, and Type II Radio Bursts in Cycles 23 and 24
Bilenko, I. A.
We consider the events of type II radio bursts (RBII) in the decametric and hectometric ranges from 1 to 16 MHz and the dependence of the parameters of associated coronal mass ejections (CMEs) on the background characteristics of the plasma and interplanetary magnetic field (IMF) in the regions where each radio burst was detected in solar cycles 2…
Correction to: The Psyche Topography and Geomorphology Investigation
Williams, David A.; Bell, James F.; Jaumann, Ralf +16 more
Satellite Galaxies' Drag on Field Stars in the Milky Way
Liu, Jifeng; Zhao, Jingkun; Liang, Xilong +1 more
With Gaia EDR3 data, velocity dispersion of Milky Way field stars around satellite galaxies has been investigated. We have fitted velocity dispersion against the distance to the satellite galaxy and found the gradient of velocity dispersion is related to the mass of the satellite galaxy. With order-of-magnitude approximations, a linear correlation…
Coronal Density Measurements Using Giant Radio Pulses of the Crab Pulsar at the Cycle 24/25 Minimum
Tokumaru, Munetoshi; Terasawa, Toshio; Takefuji, Kazuhiro +2 more
Accurate measurements of the coronal plasma density profile, which varies with the solar cycle (SC), are necessary to elucidate the solar wind acceleration. In this study, the Crab pulsar is observed using the 327 MHz radio telescope at the Toyokawa Observatory of the Institute for Space-Earth Environmental Research of Nagoya University to investi…
Multi-star System Observations Based on the Direct-imaging Method
Zhao, G.; Chen, Y. L.; Zhu, Y. T. +1 more
The direct-imaging exploration can obtain comprehensive physical information of exoplanets, which is a key technology to search for extraterrestrial life in the future. In this paper, based on our recent high-contrast imaging data of ground-based telescope, the newly discovered multi-star candidates are presented. In the early stage, combined with…