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Short-term solar eruptive activity prediction models based on machine learning approaches: A review
Xu, Long; Zhao, Zhongrui; Erdélyi, R. +3 more
Solar eruptive activities, mainly including solar flares, coronal mass ejections (CME), and solar proton events (SPE), have an important impact on space weather and our technosphere. The short-term solar eruptive activity prediction is an active field of research in the space weather prediction. Numerical, statistical, and machine learning methods…
Prospecting in-situ resources for future crewed missions to Mars
Postberg, Frank; Poulet, François; Bishop, Janice L. +3 more
The installation of planetary and lunar human outposts might be an important step for future solar system exploration by both public space agencies and private companies. Humans living and working in these artificially created habitats will possibly depend, among other life support approaches, on bio-regenerative life support systems to produce an…
Statistical geoeffectiveness of solar-interplanetary disturbance events of type II radio bursts and CMEs/shocks
Yan, Jingye; Yu, Quanyingqi
Understanding and predicting the geoeffectiveness of solar activity on Earth is crucial for space weather. Therefore, predicting the impact of coronal mass ejections (CMEs) and their associated interplanetary (IP) shocks on Earth is essential. Observations of CMEs near the Sun can be used for these prediction and to study their propagation and evo…
Determination of the SO/PHI-HRT wavefront degradation using multiple defocused images
Schmidt, W.; Woch, J.; Solanki, S. K. +50 more
Context. The Polarimetric and Helioseismic Imager on board the Solar Orbiter mission (SO/PHI) offers refocusing capabilities to cope with the strongly varying thermal environment of the optical system along the spacecraft's elliptical orbit. The series of images recorded during in-flight focus calibrations can be employed for phase diversity analy…
Photometric recalibration of VPHAS+ u-band photometry with the stellar colour regression method and Gaia DR3
Yuan, Hai-Bo; Chen, Bing-Qiu; Huang, Bo-Wen
The u-band magnitude is vital for determining stellar parameters and investigating specific astronomical objects. However, flux calibration in the u band for stars in the Galactic disc presents significant challenges. In this study, we introduce a comprehensive recalibration of u-band photometric magnitudes of the VPHAS+ Data Release 4, employing …
Measuring the impact of laser relative intensity noise on heterodyne interferometers using differential wavefront sensing
Heinzel, G.; Hewitson, M.; Wissel, L.
Laser-intensity fluctuations cause undesired phase noise even in balanced heterodyne interferometers. However, in space missions in particular, such as LISA Pathfinder or LISA, direct measurements of these fluctuations at the relevant frequencies are often not available. Hence, it can be challenging to estimate their impact on the interference pha…
Determining the Structure of the Atmosphere Exoplanet HD 189733b Based on Multicolor Photometric Transit Observations
Bekesov, E. V.
In this paper, we analyze and interpret light curves obtained by observing with the HST telescope the transit of exoplanet HD 189733b across the disk of the star. Observations are carried out in a wide wavelength range of 5500–10 500 Å, which makes it possible to identify the relation between the wavelength and the data obtained during the interpr…
Luminosity dependent cyclotron line in Swift J1626.6‑5156
Paul, Biswajit; Tobrej, Mohammed; Rai, Binay +3 more
We studied the timing and spectral properties of the Be/X-ray pulsar Swift J1626.6‑5156 using the NICER observations of its 2021 outburst. The most important observation is the positive correlation of the centroid energy of the fundamental cyclotron line with the luminosity. This observation agrees with the usual positive correlation of the centro…
Temperature Intermittent Structures in the Fast Solar Wind
Wang, Xin; Wang, Yuxin; Song, Dongze +1 more
In the solar wind turbulence, proton temperature fluctuations are highly intermittent, especially at small scales in the inertial range. This phenomenon may contain information about solar wind intermittent heating. However, the physical nature of the temperature intermittency is not yet clear. Based on the measurements from Solar Orbiter between …
Radial velocity analysis of stars with debris discs
Jones, Hugh R. A.; Bisht, Deepak
This study aims to identify potential exoplanet signals from nearby stars with resolved debris discs. However, the high activity of many stars with debris discs limits the detection of periodic signals. Our study is constrained to a sample of 29 stars that have appropriate radial velocity data and debris disc measurements sufficient to resolve the…