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Water Production Rate of C/2020 F3 (NEOWISE) from SOHO/SWAN over Its Active Apparition
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +2 more
C/2020 F3 (NEOWISE) was discovered in images from the Near Earth Object program of the Wide-Field Infrared Survey Explorer (NEOWISE) taken on 2020 March 27 and has become the Great Comet of 2020. The Solar Wind ANisotropies (SWAN) camera on the Solar and Heliospheric Observatory (SOHO) spacecraft, located in a halo orbit around the Earth-Sun L1 La…
Correlation of the Sunspot Number and the Waiting-time Distribution of Solar Flares, Coronal Mass Ejections, and Solar Wind Switchback Events Observed with the Parker Solar Probe
Dudok de Wit, Thierry; Aschwanden, Markus J.
Waiting-time distributions of solar flares and coronal mass ejections (CMEs) exhibit power-law-like distribution functions with slopes in the range of ατ ≈ 1.4-3.2, as observed in annual data sets during four solar cycles (1974-2012). We find a close correlation between the waiting-time power-law slope ατ and the sunspot numb…
Shock-wave Radio Probing of Solar Wind Sources in Coronal Magnetic Fields
Koval, Artem; Stanislavsky, Aleksander; Wang, Bing +3 more
The space weather effects in the near-Earth environment as well as in atmospheres of other terrestrial planets arise by corpuscular radiation from the Sun, known as the solar wind. The solar magnetic fields govern the solar corona structure. Magnetic-field strength values in the solar wind sources-key information for modeling and forecasting the s…
Simultaneous Observation of an Auroral Dawn Storm With the Hubble Space Telescope and Juno
Wilson, R. J.; Kurth, W. S.; Bagenal, F. +7 more
On July 13, 2016, the Hubble Space Telescope observed the onset of a dawn storm in Jupiter's northern ultraviolet aurora, while the NASA Juno spacecraft simultaneously traversed the dawnside outer magnetosphere. This represents the first concurrent auroral and in situ magnetospheric observations of the onset of a dawn storm at Jupiter. Mapping the…
New precise positions in 2013-2019 and a catalog of ground-based astrometric observations of 11 Neptunian satellites (1847-2019) based on Gaia-DR2
Ren, Shulin; Fu, Yanning; Yuan, Ye +1 more
Context. Developing high-precision ephemerides for Neptunian satellites requires not only the continuation of observing campaigns but also the collection and improvement of existing observations. So far, no complete catalogs of observations of Neptunian satellites are available.
Aims: We aim to provide new, precise positions, and to compile a…
Over-expansion of a coronal mass ejection generates sub-Alfvénic plasma conditions in the solar wind at Earth
Schmieder, B.; Poedts, S.; Démoulin, P. +4 more
Context. From May 24-25, 2002, four spacecraft located in the solar wind at about 1 astronomical unit (au) measured plasma densities one to two orders of magnitude lower than usual. The density was so low that the flow became sub-Alfvénic for four hours, and the Alfvén Mach number was as low as 0.4. Consequently, the Earth lost its bow shock, and …
Ultrafaint [C II] Emission in a Redshift = 2 Gravitationally Lensed Metal-poor Dwarf Galaxy
Walter, F.; van der Wel, A.; Groves, B. +13 more
Extreme emission-line galaxies (EELGs) at redshift z = 1-2 provide a unique view of metal-poor, starburst sources that are the likely drivers of the cosmic reionization at z ≥ 6. However, the molecular gas reservoirs of EELGs—the fuel for their intense star formation—remain beyond the reach of current facilities. We present ALMA [C II] and PdBI CO…
Boyajian's Star B: The Co-moving Companion to KIC 8462852 A
Huber, Daniel; Dupuy, Trent J.; Kraus, Adam L. +2 more
The light curve of KIC 8462852, aka Boyajian's Star, undergoes deep dips the origin of which remains unclear. A faint star ≈2″ to the east was discovered in Keck/NIRC2 imaging in Boyajian et al., but its status as a binary, and possible contribution to the observed variability, was unclear. Here, we use three epochs of Keck/NIRC2 imaging, spanning…
Use of the DBM Model to the Predict of Arrival of Coronal Mass Ejections to the Earth
Kaportseva, K. B.; Shugay, Yu. S.
This paper analyzes the results of modeling coronal mass ejection (CME) propagation in 2010-2011 obtained using input data from different sources: CME catalogs SEEDS and CACTus, and predictions of the velocity of quasi-stationary solar wind fluxes, as an environment, through which CMEs propagate. As the model of quasi-stationary solar wind fluxes,…
Plasma Upflows Induced by Magnetic Reconnection Above an Eruptive Flux Rope
Long, David M.; Janvier, Miho; Brooks, David H. +6 more
One of the major discoveries of Hinode's Extreme-ultraviolet Imaging Spectrometer (EIS) is the presence of upflows at the edges of active regions. As active regions are magnetically connected to the large-scale field of the corona, these upflows are a likely contributor to the global mass cycle in the corona. Here we examine the driving mechanism(…