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Structure and Dynamics of Cool Flare Loops Observed by the Interface Region Imaging Spectrograph
Heinzel, P.; Berlicki, A.; Liu, W. +1 more
Flare loops were well observed with the Interface Region Imaging Spectrograph (IRIS) during the gradual phase of two solar flares on 2014 March 29 and 2015 June 22. Cool flare loops are visible in various spectral lines formed at chromospheric and transition-region temperatures and exhibit large downflows which correspond to the standard scenario.…
Detection of Coronal Mass Ejections Using Multiple Features and Space-Time Continuity
Zhang, Ling; Yin, Jian-qin; Lin, Jia-ben +2 more
Coronal Mass Ejections (CMEs) release tremendous amounts of energy in the solar system, which has an impact on satellites, power facilities and wireless transmission. To effectively detect a CME in Large Angle Spectrometric Coronagraph (LASCO) C2 images, we propose a novel algorithm to locate the suspected CME regions, using the Extreme Learning M…
Radiative energy balance of Venus: An approach to parameterize thermal cooling and solar heating rates
Kappel, D.; Arnold, G.; Haus, R.
Thermal cooling rates QC and solar heating rates QH in the atmosphere of Venus at altitudes between 0 and 100 km are investigated using the radiative transfer and radiative balance simulation techniques described by Haus et al. (2015b, 2016). QC strongly responds to temperature profile and cloud parameter changes, …
The Stochastic X-Ray Variability of the Accreting Millisecond Pulsar MAXI J0911-655
Bult, Peter
In this work, I report on the stochastic X-ray variability of the 340 Hz accreting millisecond pulsar MAXI J0911-655. Analyzing pointed observations of the XMM-Newton and NuSTAR observatories, I find that the source shows broad band-limited stochastic variability in the 0.01{--}10 {Hz} range with a total fractional variability of ∼ 24 % rms in the…
Atomic hydrogen bridge fueling NGC 4418 with gas from VV 655
Privon, G. C.; Aalto, S.; Klöckner, H. -R. +6 more
Context. The galaxy
IGR J17445-2747—Yet another X-ray burster in the galactic bulge
Sunyaev, R. A.; Grebenev, S. A.; Mereminskiy, I. A.
The discovery of a type I X-ray burst from the faint unidentified transient source IGR J17445-2747 in the Galactic bulge by the JEM-X telescope onboard the INTEGRAL observatory is reported. Type I bursts are believed to be associated with thermonuclear explosions of accreted matter on the surface of a neutron star with a weak magnetic field in a l…
Near-infrared Spectroscopy of Five Ultra-massive Galaxies at 1.7 < z < 2.7
Muzzin, Adam; Labbé, Ivo; Quadri, Ryan +13 more
We present the results of a pilot near-infrared spectroscopic campaign of five very massive galaxies ({log}({M}\star /{M}⊙ )> 11.45) in the range of 1.7< z< 2.7. We measure an absorption feature redshift for one galaxy at {z}{spec}=2.000+/- 0.006. For the remaining galaxies, we combine the photometry with …
Automatic Near-Real-Time Detection of CMEs in Mauna Loa K-Cor Coronagraph Images
St. Cyr, O. C.; Burkepile, J. T.; Posner, A. +1 more
A simple algorithm has been developed to detect the onset of coronal mass ejections (CMEs), together with speed estimates, in near-real time using linearly polarized white-light solar coronal images from the Mauna Loa Solar Observatory K-Cor telescope. Ground observations in the low corona can warn of CMEs well before they appear in space coronagr…
Charge exchange in the ultraviolet: implication for interacting clouds in the core of NGC 1275
Baum, Stefi A.; O'Dea, Christopher P.; Gu, Liyi +3 more
Context. Charge exchange emission is known to provide a key diagnostic to the interface between hot and cold matter in many astrophysical environments. Most of the recent charge exchange studies focus on its emission in the X-ray band; only a few focus on the UV, even though it can also provide a powerful probe of the charge exchange process.
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HD 240121 - An ACV variable showing anti-phase variations of the B and V light curves
Paunzen, Ernst; Gröbel, Rainer; Hümmerich, Stefan +1 more
The variability of HD 240121 = BD+59 2602 was first suspected by Särg and Wramdemark (1970) and later confirmed by Gröbel R. (1992a,b). Because of the observed anti-phase variations of the B and V light curves, the latter author tentatively suggested an ACV type. Apart from its inclusion in the catalog of New Suspected Variables (NSV 25977), no fu…