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A three-dimensional velocity of an erupting prominence prior to a coronal mass ejection
Shibata, Kazunari; Ishii, Takako T.; Kitai, Reizaburo +10 more
We present a detailed three-dimensional (3D) view of a prominence eruption, coronal loop expansion, and coronal mass ejections (CMEs) associated with an M4.4 flare that occurred on 2011 March 8 in the active region NOAA 11165. Full-disk Hα images of the flare and filament ejection were successfully obtained by the Flare Monitoring Telescope (FMT) …
Physical Characteristics of Unstructured Coronal Clouds
Golub, L.; Hahn, M.; Savin, D. W. +2 more
Active regions in the inner solar corona, when observed in X-ray emission, consist of bright, hot loops surrounded by unstructured clouds. The emission from the clouds extends to a height of ≈4-5 × 104 km at temperatures of ≈2-3 MK. These "hot clouds" are variable, but persist for many days and do not appear to connect directly to the a…
INTEGRAL View of TeV Sources: A Legacy for the CTA Project
Ubertini, Pietro; Bazzano, Angela; Bird, Antony J. +7 more
Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic Black-Holes, Neutron Stars, Supernova Remnants/Pulsar Wind Nebulae, and other regions of the Universe where relativi…
Titan's Global Radiant Energy Budget During the Cassini Epoch (2004-2017)
West, Robert A.; Nixon, Conor A.; Fry, Patrick M. +5 more
Radiant energies of planets and moons are of wide interest in the fields of geoscience and planetary science. Based on long-term multiinstrument observations from the Cassini spacecraft, we provide here the first observational study of Titan's global radiant energy budget and its seasonal variations. Our results show that Titan's radiant energy bu…
The connection between space weather and Single Event Upsets in polar low earth orbit satellites
Katz, Sari; Goldvais, Uriel; Price, Colin
Space weather is driven and modulated by the activity in the Sun. Space weather events have the potential to inflict critical damage to space systems. Nowadays, space assets are essential in our basic needs, such as communications, cell phone networks, navigation systems, television and internet. Hence, understanding space weather dynamics and its…
A photospheric and chromospheric activity analysis of the quiescent retrograde-planet host ν Octantis A
Cantalloube, F.; Reffert, S.; Robertson, P. +4 more
The single-lined spectroscopic binary ν Octantis provided evidence of the first conjectured circumstellar planet demanding an orbit retrograde to the stellar orbits. The planet-like behaviour is now based on 1437 radial velocities (RVs) acquired from 2001 to 2013. ν Oct's semimajor axis is only 2.6 au with the candidate planet orbiting $\nu ~{\rm …
The First Photometric Investigation and Spectroscopic Analysis of Two Contact Binaries: ASAS J124343+1531.7 and LINEAR 2323566
Li, Kai; Michel, Raul; Xia, Qiqi +1 more
The multi-color passband CCD light curves of ASAS J124343+1531.7 and LINEAR 2323566 were first obtained by the 0.84 m Ritchey-Chrétien telescope with follow up observations by the WIYN 0.90 m Cassegrain telescope. The data from the Transiting Exoplanet Survey Satellite of ASAS J124343+1531.7 was also applied for subsequent analysis. By analyzing t…
Characterization of HD 206893 B from Near- to Thermal-infrared
Lee, Eve J.; Gao, Peter; Beichman, Charles +9 more
HD 206893 B is a brown-dwarf companion orbiting inside the debris disk of its host star. We detect the brown dwarf in the Ms band using the Keck/NIRC2 instrument and vortex coronagraph. We measure its magnitude to be ${Ms}={12.97}_{-0.11}^{0.10}$ . It is at an angular separation of 0"22 ± 0"03, and a position angle of 39.6° ± 5.4° east of north. U…
Collisional effects in the blue wing of Lyman-α
Kielkopf, J. F.; Allard, N. F.; Spiegelman, F.
Spectral observations below Lyman-α are now obtained with the Cosmic Origin Spectrograph (COS) on the Hubble Space Telescope. It is therefore necessary to provide an accurate treatment of the blue wing of the Lyman-α line that enables correct calculations of radiative transport in DA and DBA white dwarf stars. On the theoretical front, we very rec…
Ion Convection as a Function of Distance to the Neutral Sheet in Earth's Magnetotail
Hamrin, M.; Pitkänen, T.; Chong, Ghai Siung +1 more
We utilized 33 years of data obtained by the Geotail, THEMIS, Cluster and MMS missions to investigate the slow (<200 km/s) ion flows perpendicular to the magnetic field in Earth's magnetotail plasma sheet. By using plasma β as a proxy of distance to the neutral sheet, we find that the ion flow patterns vary systematically within the plasma shee…