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Data mining for vortices on the Earth's magnetosphere - algorithm application for detection and analysis
Collado-Vega, Yaireska M.; Kalb, Virginia L.; Sibeck, David G. +2 more
Unsteady processes in the solar wind-magnetosphere interaction, such as vortices developed at the magnetopause boundary by the Kelvin-Helmholtz instability, may contribute to the process of mass, momentum and energy transfer into the Earth's magnetosphere. The research described in this paper validates an algorithm to automatically detect and char…
Serverless Computing: From Planet Mars to the Cloud
Vazquez-Poletti, Jose Luis; Llorente, Ignacio Martin
CME productivity associated with Solar Flare peak X-ray emission flux
Suryanarayana, G. S.; Balakrishna, K. M.
It is often noticed that the occurrence rate of Coronal Mass Ejections (CMEs) increases with increase in flare duration where peak flux too increase. However, there is no complete association between the duration and peak flux. Distinct characteristics have been reported for active regions (ARs) where flares and CMEs occur in contrast to ARs where…
Energy-dependent intensity variation of the persistent X-ray emission of magnetars observed with Suzaku
Enoto, Teruaki; Ebisawa, Ken; Nakagawa, Yujin
The emission mechanism of magnetars is still controversial even though various observational and theoretical studies have been made. In order to investigate mechanisms of both the persistent X-ray emission and the burst emission of the magnetars, we propose a model in which the persistent X-ray emission consists of numerous micro-bursts of various…
New Variables Discovered by Data Mining Images Taken During Recent Asteroid Photometric Surveys at the Astronomical Observatory of the University of Siena: Results for the Year 2017
Arena, C.; Bachini, M.; Succi, G. +5 more
This paper continues the publication of the list of the new variables discovered at Astronomical Observatory, DSFTA, University of Siena, while observing asteroids for determining their rotational periods. Further observations of these new variables are strongly encouraged in order to better characterize these stars, especially those showing non-o…
Recurrent Outbursts Revealed in 3XMM J031820.8-663034
Weng, Shan-Shan; Zhao, Hai-Hui; Wang, Jun-Xian
3XMM J031820.8-663034, first detected by ROSAT in NGC 1313, is one of a few known transient ultraluminous X-ray sources (ULXs). In this paper, we present decades of X-ray data of this source from ROSAT, XMM-Newton, Chandra, and the Neil Gehrels Swift Observatory. We find that its X-ray emission experienced four outbursts since 1992, with a typical…
Evidence of ancient Milky Way merger
Venn, Kim
An analysis of data from the Gaia space observatory suggests that stars in the inner halo of the Milky Way originated in another galaxy. This galaxy is thought to have collided with the Milky Way about ten billion years ago.
Mean Occupation Function of High-redshift Quasars from the Planck Cluster Catalog
Myers, Adam D.; Chakraborty, Priyanka; Chatterjee, Suchetana +1 more
We characterize the distribution of quasars within dark matter halos using a direct measurement technique for the first time at redshifts as high as z ∼ 1. Using the Planck Sunyaev-Zeldovich (SZ) catalog for galaxy groups and the Sloan Digital Sky Survey (SDSS) DR12 quasar data set, we assign host clusters/groups to the quasars and make a measurem…
Dust color temperature distribution of two FIR cavities at IRIS and AKARI maps
Jha, A. K.; Aryal, B.
By systematically searching the region of far infrared loops, we found a number of huge cavity-like dust structures at
Hinode Observations of Flows and Heating Associated with Magnetic Reconnection During Solar Flares
Reeves, Katharine K.