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X-ray lines and self-interacting dark matter
Mambrini, Yann; Toma, Takashi
We study the correlation between a monochromatic signal from annihilating dark matter and its self-interacting cross section. We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model. We combine the recent observat…
Modeling the interaction between convection and nonthermal ion outflows
Wiltberger, M.; Lotko, W.; Varney, R. H.
Initial demonstrations of an ionosphere/polar wind model including a phenomenological treatment of transverse heating by wave particle interactions (WPIs) are presented. Tests with fixed WPI parameters in a designated heating region on the dayside with time-varying convection show that the parameters of the resulting nonthermal ion outflow are str…
Quasi-periodic Oscillation of a Coronal Bright Point
Tian, Hui; Banerjee, Dipankar; Samanta, Tanmoy
Coronal bright points (BPs) are small-scale luminous features seen in the solar corona. Quasi-periodic brightenings are frequently observed in the BPs and are generally linked with underlying magnetic flux changes. We study the dynamics of a BP seen in the coronal hole using the Atmospheric Imaging Assembly images, the Helioseismic and Magnetic Im…
Pan-Chromatic Observations of the Remarkable Nova Large Magellanic Cloud 2012
Walter, Frederick M.; Drake, Jeremy J.; Woodward, Charles E. +9 more
We present the results of an intensive multiwavelength campaign on nova LMC 2012. This nova evolved very rapidly in all observed wavelengths. The time to fall two magnitudes in the V band was only 2 days. In X-rays the super soft phase began 13 ± 5 days after discovery and ended around day 50 after discovery. During the super soft phase, the Swift…
On Extreme-ultraviolet Helium Line Intensity Enhancement Factors on the Sun
Curdt, W.; Fludra, A.; Lanzafame, A. C. +3 more
Helium lines in the solar EUV spectrum provide useful diagnostics of the solar atmosphere plasma. Helium is one of the few elements that exhibits strong emission lines formed in the lower transition region, and it is the second most abundant element in the Sun. However, the analysis of helium lines is complicated by their optical thickness and the…
Solar zenith angle-dependent asymmetries in Venusian bow shock location revealed by Venus Express
Zhang, Tielong; Rong, Zhaojin; Futaana, Yoshifumi +8 more
It has been long known that the Venusian bow shock (BS) location is asymmetric from the observations of the long-lived Pioneer Venus Orbiter mission. The Venus Express (VEX) mission crossed BS near perpendicularly not only in the terminator region but also in the near-subsolar and tail regions. Taking the advantage of VEX orbit geometry, we examin…
Nonlinear MHD Waves in a Prominence Foot
Schmieder, B.; Ofman, L.; Kucera, T. +1 more
We study nonlinear waves in a prominence foot using a 2.5D MHD model motivated by recent high-resolution observations with Hinode/Solar Optical Telescope in Ca ii emission of a prominence on 2012 October 10 showing highly dynamic small-scale motions in the prominence material. Observations of Hα intensities and of Doppler shifts show similar propa…
Evidence for a seasonally dependent ring plasma in the region between Saturn's A Ring and Enceladus' orbit
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +2 more
Equatorial electron density measurements from the Cassini Radio and Plasma Wave Science experiment are derived from the upper hybrid resonance frequency from Saturn Orbit Insertion (SOI) on 1 July 2004 through 21 May 2013. These densities are used to determine the characteristics of the plasma in the inner magnetosphere of Saturn between the outer…
Investigation on Radio-Quiet and Radio-Loud Fast CMEs and Their Associated Flares During Solar Cycles 23 and 24
Shanmugaraju, A.; Suresh, K.
We present the results of a detailed analysis on the differences between radio-loud (RL) and radio-quiet (RQ) fast coronal mass ejections (CMEs) (V≥900 km s−1) observed during the period 1996 - 2012. The analysis consists of three different steps in which we examined the properties of (i) RL and RQ CMEs, (ii) accelerating (class-A) and …
Coma dust scattering concepts applied to the Rosetta mission
Fink, Uwe; Rinaldi, Giovanna
This paper describes basic concepts, as well as providing a framework, for the interpretation of the light scattered by the dust in a cometary coma as observed by instruments on a spacecraft such as Rosetta. It is shown that the expected optical depths are small enough that single scattering can be applied. Each of the quantities that contribute t…