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Imaging Preflare Broadband Pulsations in the Decimetric-metric Wavelengths
Chen, Yao; Tan, Baolin; Zheng, Ruisheng +4 more
Preflare activities contain critical information about the precursors and causes of solar eruptions. Here we investigate the characteristics and origin of a group of broadband pulsations (BBPs) in the decimetric-metric wavelengths that took place during the preflare stage of the M7.1 flare on 2011 September 24. The event was recorded by multiple s…
Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades
Mohorian, Maksym; Bhatta, Gopal; Adhikari, Tek P. +5 more
Blazars exhibit relentless variability across diverse spatial and temporal frequencies. The study of long- and short-term variability properties observed in the X-ray band provides insights into the inner workings of the central engine. In this work, we present timing and spectral analyses of the blazar 3C 273 using the X-ray observations from the…
Optical and X-Ray Studies of Marginal Contact Binary RW Dor Using TESS and XMM-Newton Observatories
Sriram, K.; Mamatha Rani, G.
Marginal short-period contact binaries are important to understand as they pose a different physical scenario than the predicted theoretical model based on the thermal relaxation oscillation mechanism due to their shallow degree of contact. Here we present the optical and X-ray studies of a contact binary source RW Dor using the Transiting Exoplan…
Influence of the dynamic classification of asteroids on observation astrometric errors: a statistical analysis
Stronati, N.; Faggioli, L.; Micheli, M. +1 more
The ephemerides of minor planets are computed on the basis of astrometric observations. The asteroid orbit determination process requires these observations to be properly weighted to take into account the expected accuracy of the data. If not directly provided by the observers, the weights are, in general, computed after a station-specific statis…
A Comprehensive Study of Soft X-ray Absorption Features in GX 13+1 Using XMM-Newton Observations
Mahato, Rabindra; Baruah, Monmoyuri
In this study, a comprehensive analysis of the reflection grating spectrometer (RGS) data (energy range 0.33 keV to 2.5 keV) of GX 13+1 from the XMM-Newton space observatory was conducted. Numerous absorption lines have been described in earlier publications, although the majority of these investigations focused on the energy range between 3 keV a…
Temporal and Latitudinal Variation in Penumbra-Umbra Ratios of the Sunspots: Analyses of RGO, Kodaikanal and Debrecen Databases
Takalo, Jouni
We study the latitudinal distribution and temporal evolution of the sunspot penumbra-umbra ratio (q ) for the even and odd Solar Cycles 12 - 24 of RGO sunspot groups, SC21 - SC24 of Debrecen sunspot groups and Kodaikanal sunspot dataset for SC16 - SC24. We find that RGO even (odd) Cycles have q -values 5.20 (4.75), Kodaikanal even (odd) cycles hav…
[C I] and [C II] emission in the circumstellar envelope of IRC +10216. I. Observational data and NLTE modelling of the [C I] emission
Menten, K. M.; Wyrowski, F.; Wiesemeyer, H. +1 more
Context. The envelopes of evolved late-type stars on the asymptotic giant branch are characterised by a complex chemistry that is close to thermochemical equilibrium near the stellar surface; however, in the outer envelope, it is dominated by radical reactions, assisted by a photo-chemistry driven by the interstellar radiation field.
Aims: Th…
Magnetic holes between Earth and Mercury: BepiColombo cruise phase
Glassmeier, K. -H.; Karlsson, T.; Nakamura, R. +14 more
Context. Magnetic holes are ubiquitous structures in the solar wind and in planetary magnetosheaths. They consist of a strong depression of the magnetic field strength, most likely in pressure balance through increased plasma pressure, which is convected with the plasma flow. These structures are created through a plasma temperature anisotropy, wh…
Links between optical and X-ray light in Scorpius X-1
Britt, C. T.; Hynes, R. I.; Igl, Alexander B. +2 more
We observed the low-mass X-ray binary Sco X-1 for 12 nights simultaneously using the Rossi X-Ray Timing Explorer and the Otto Struve Telescope at McDonald Observatory at 1-s time-resolution. This is among the most comprehensive simultaneous X-Ray/optical data sets of Sco X-1. Evidence of reprocessing was observed in the form of nine positive, near…
Unveiling the Subsurface of Late Amazonian Lava Flows at Echus Chasma, on Mars
Mansilla, Federico; Zorzano, María-Paz; Giannakis, Iraklis +1 more
The Echus-Kasei region on Mars has been exposed to different episodic volcanic, fluvial, and glacial events in Amazonian time. The goal of the present work is to demonstrate the usefulness of radar instruments to find preserved late Amazonian subsurface structures that may have been encapsulated underneath recent lava flows on Mars. We have analys…