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Photospheric Stereoscopy: Direct Estimation of Solar Surface-Height Variations
Hirzberger, Johann; Solanki, Sami K.; Inhester, Bernd +1 more
The orbit of the Solar Orbiter mission carries it and the Polarimetric and Helioseismic Imager (PHI), which is onboard, away from the Sun–Earth line, opening up the first ever possibility of doing stereoscopy of solar photospheric structures. We present a method for a stereoscopic analysis of the height variations in the solar photosphere. This me…
On Possible Additional Sources of Solar Protons in the Events of September 4–10, 2017
Struminsky, A. B.; Grigor'eva, I. Yu.; Ozheredov, V. A.
The article considers the period from September 4 to September 10, 2017, inclusive, during which the last proton events of solar cycle 24 occurred. In order to detect possible additional proton sources and verify the sources already listed in various catalogs, we apply an empirical method for predicting proton events to all solar flares detected d…
Statistics of Solar White-light Flares. I. Optimization and Application of Identification Methods
Hou, Yijun; Li, Ting; Liu, Jifeng +1 more
White-light flares (WLFs) are energetic activity in the stellar atmosphere. However, observed solar WLFs are relatively rare compared to stellar WLFs or solar flares observed at other wavelengths, which limits our further understanding of solar/stellar WLFs through statistical studies. By analyzing flare observations from the Solar Dynamics Observ…
Description of turbulent dynamics in the interstellar medium: Multifractal microcanonical analysis. II. Sparse filtering of Herschel observation maps and visualization of filamentary structures at different length scales
Schneider, N.; Bontemps, S.; Simon, R. +15 more
We present significant improvements to our previous work on noise reduction in Herschel observation maps by defining sparse filtering tools capable of handling, in a unified formalism, a significantly improved noise reduction as well as a deconvolution in order to reduce effects introduced by the limited instrumental response (beam). We implement …
Crustal origin for olivine in the lunar Shioli crater ejecta boulders: Insights from the geological setting of Theophilus crater and Nectaris basin
Bhattacharya, Satadru; Pathak, Sumit; Kumar, P. Senthil +6 more
On the Moon, impact craters and basins expose a wide range of crustal and mantle rocks that provide excellent opportunity for sampling them, understanding their origins and reconstructing spatial and temporal evolution of lunar interior. The previous studies detected olivine-bearing mantle rocks in and around large impact craters and basins. The J…
XMM-Newton Perspective of the Unique Magnetic Binary-ϵ Lupi
Wade, Gregg A.; Biswas, Ayan; Chandra, Poonam +3 more
The ϵ Lupi A (HD 136504) system stands out among magnetic massive binaries as the only short-period binary system in which both components have detectable magnetic fields. The proximity of the magnetospheres of the components leads to magnetospheric interactions, which are revealed as periodic pulses in the radio light curve of this system. In thi…
Transition Region Brightening in a Moss Region and Their Relation with Lower Atmospheric Dynamics
Joshi, Jayant; Chen, Yajie; Yurchyshyn, Vasyl +5 more
Small-scale brightenings (SBs) are commonly observed in the transition region (TR) that separates the solar chromosphere from the corona. These brightenings, omnipresent in active region patches known as "moss" regions, could potentially contribute to the heating of active region plasma. In this study, we investigate the properties of SB events in…
KIC 8840638: A Newly Discovered Eclipsing Binary with δ Scuti–Type Oscillations
Yang, Tao-Zhi; Zuo, Zhao-Yu; Liu, Jun-Hui +4 more
In this paper, we analyze the light variation of KIC 8840638 using high-precision time-series data from the Kepler mission. The analysis reveals that this target is a new detached eclipsing binary system with a δ Scuti component, rather than a single δ Scuti star as previously known. The frequency analysis of short-cadence data reveals 95 signific…
The Dynamic Venusian Bow Shock Model With the Nonlinear Effect of Magnetosonic Mach Number Based on Venus Express Observations
Xu, Qi; Zhang, Tielong; Zuo, Pingbing +8 more
Utilizing the 8.5-year Venus Express observations, we investigate the effects of solar wind magnetosonic Mach number MMS $\left({M}_{MS}\right)$, solar extreme ultraviolet (EUV) radiation, solar wind dynamic pressure Pd $\left({P}_{d}\right)$ and interplanetary magnetic field (IMF) on the shape of the Venusian bow shock. Our statistical analysis y…
TESS Observations of Outbursts on Polars—Superflares
Qian, Shengbang; Wang, Qishan; Fang, Xiaohui
Flare events are magnetic activities on the stellar surface, which can provide us with information about the accretion behavior and evolution of polars. In this paper, we search for flare events on polars from all the available 2 minute cadence TESS data through visual inspection, and identify six flare events on five flaring stars from 185 polars…