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A Precursor to Solar Prominence Eruptions: Detection and Analysis of EUV Prominence Oscillations
Foullon, Claire; Verwichte, Erwin; Beckwith-Chandler, William
The eruption of prominences can have a significant influence on the solar–terrestrial environment. However, accurately predicting these eruptions remains a challenge. We apply automated detection methods for extreme ultraviolet (EUV) prominences observed by the twin spacecraft from the Solar Terrestrial Relations Observatory (STEREO) mission and t…
Energy Dependence of Solar Energetic Protons and Their Origin in Solar Cycles 23 and 24
Miteva, Rositsa; Dechev, Momchil; Samwel, Susan W.
The study presents the compilation of a comprehensive catalog of solar energetic protons (SEPs) in solar cycles (SCs) 23 and 24 (1996–2019) in 10 energy channels from about 20 to 100 MeV based on data from the Energetic and Relativistic Nuclei and Electron (ERNE) instrument aboard Solar and Heliospheric Observatory (SOHO). For comparison, we added…
Targeting Shallow Subsurface Sampling for Mars at Oxia Planum Using Fluvial Erosion–Deposition Modeling
Steinmann, Vilmos; Kereszturi, Ákos
A model-based surface fluvial erosion and deposition approach was adapted to Martian conditions to forecast the potential locations for shallow subsurface sampling by the Rosalind Franklin ExoMars rover at Oxia Planum. While remote and on-site images show only the surface visible features, former fluvial-related accumulation sites might be hidden.…
Probing grand unification with quantum sensors
Calmet, Xavier; Sherrill, Nathaniel
We discuss how grand unification can be probed with experiments at low energies using quantum sensors. Specifically, we show that scalar multiplets coupled to the gauge sector of a grand unified theory provide a mechanism for a time-varying unified coupling which has low-energy consequences which can be probed with quantum sensors. We then assume …
A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North
Burgarella, D.; Shimwell, T. W.; Serjeant, S. +17 more
This paper presents a 610 MHz radio survey covering 1.94 deg
A soft and transient ultraluminous X-ray source with six-hour modulation in the NGC 300 galaxy
Tiengo, A.; de Martino, D.; Pinto, C. +13 more
We investigate the nature of CXOU J005440.5−374320 (J0054), a peculiar bright (∼4 × 1039 erg s−1) and soft X-ray transient in the spiral galaxy NGC 300 with a six-hour periodic flux modulation that was detected in a 2014 Chandra observation. Subsequent observations with Chandra and XMM-Newton, as well as a large observational…
The Differences in the Origination and Properties of the Near-Earth Solar Wind between Solar Cycles 23 and 24
Fu, Hui; Xia, Lidong; Huang, Zhenghua +5 more
The dependence of the sources and properties of the near-Earth solar wind on solar cycle activity is an important issue in solar and space physics. We use the improved "two-step" mapping procedure that takes into account the initial acceleration processes to trace the near-Earth solar winds back to their source regions from 1999–2020, covering sol…
Mini-Plasmaströme als Quelle des Sonnenwindes
Schühle, Udo; Peter, Hardi; Chitta, Lakshmi Pradeep
Aufnahmen der Raumsonde Solar Orbiter der ESA und NASA bieten den bisher detailliertesten Blick auf eine Quellregion des Teilchenstroms von der Sonne. Das legt nahe, dass der Sonnenwind nicht als gleichmäßiger Teilchenstrom ausgestoßen wird.
Markov Chain Monte Carlo optimization applied to double stars from Miller & Pitman research
Budding, Edwin; Rhodes, Michael D.; Banks, Timothy +1 more
Model orbits have been fitted to 27 physical double stars listed in a 1922 catalog. A Markov Chain Monte Carlo technique was applied to estimate best-fitting values and associated uncertainties for the orbital parameters. Dynamical masses were calculated using parallaxes from the Hipparcos mission and are presented in this paper with the estimates…
The Radio Continuum Source Projected Near HR 8799
Zapata, L. A.; Rodríguez, L. F.
HR 8799 is an A5/F0 V star where exoplanets were first directly imaged. Four exoplanets were found within ≃ 2." 0 from the star. Here we report the VLA detection of a faint (19.1±2.7 µJy) radio continuum (3.0 GHz) source projected at ≃ 2." 2 from the star. The a priori probability of finding a background source with this flux densi…