Results 111 to 120 of about 3,680 (199)

Do Young Suns Produce Frequent, Massive CMEs? Results from Five-year Dedicated Optical Observations of EK Draconis and V889 Hercules

The Astrophysical Journal
We report results from a five-year (132-night) dedicated observational campaign targeting two nearby young solar-type stars, EK Draconis (∼50–125 Myr age) and V889 Hercules (∼30 Myr age), using the 3.8 m Seimei Telescope and Transiting Exoplanet Survey ...
Kosuke Namekata, Hiroyuki Maehara, Yuta Notsu, Satoshi Honda, Kai Ikuta, Daisaku Nogami, Kazunari Shibata   +6 more
doaj   +1 more source

Extreme energetic particle events by superflare-asssociated CMEs from solar-like stars. [PDF]

Sci Adv, 2022
Hu J, Airapetian VS, Li G, Zank G, Jin M.   +4 more
europepmc   +1 more source

Apache Point Observatory (APO)/SMARTS Flare Star Campaign Observations. I. Blue Wing Asymmetries in Chromospheric Lines during Mid-M-Dwarf Flares from Simultaneous Spectroscopic and Photometric Observation Data

The Astrophysical Journal
We conducted the time-resolved simultaneous optical spectroscopic and photometric observations of mid-M-dwarf flare stars YZ CMi, EV Lac, and AD Leo. Spectroscopic observations were obtained using Apache Point Observatory 3.5 m and Small and Moderate ...
Yuta Notsu, Adam F. Kowalski, Hiroyuki Maehara, Kosuke Namekata, Kenji Hamaguchi, Teruaki Enoto, Isaiah I. Tristan, Suzanne L. Hawley, James R. A. Davenport, Satoshi Honda, Kai Ikuta, Shun Inoue, Keiichi Namizaki, Daisaku Nogami, Kazunari Shibata   +14 more
doaj   +1 more source

Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. II. Understanding Prominence Eruption through Data-driven Modeling and Observed Magnetic Environment

The Astrophysical Journal
EK Draconis, a nearby young solar-type star (G1.5V, 50–120 Myr), is known as one of the best proxies for inferring the environmental conditions of the young Sun.
Kosuke Namekata, Kai Ikuta, Pascal Petit, Vladimir S. Airapetian, Aline A. Vidotto, Petr Heinzel, Jiří Wollmann, Hiroyuki Maehara, Yuta Notsu, Shun Inoue, Stephen Marsden, Julien Morin, Sandra V. Jeffers, Coralie Neiner, Rishi R. Paudel, Antoaneta A. Avramova-Boncheva, Keith Gendreau, Kazunari Shibata   +17 more
doaj   +1 more source

Solar astronomy [PDF]

An overview is given of modern solar physics. Topics covered include the solar interior, the solar surface, the solar atmosphere, the Large Earth-based Solar Telescope (LEST), the Orbiting Solar Laboratory, the High Energy Solar Physics mission, the ...
Antiochos, Spiro K., Canfield, Richard C., Chupp, Edward L., Deming, Drake, Doschek, George A., Dulk, George A., Foukal, Peter V., Gilliland, Ronald L., Noyes, Robert, Rosner, Robert   +9 more
core   +1 more source

Effects of Transient Stellar Emissions on Planetary Climates of Tidally Locked Exo-Earths

The Astronomical Journal
Space weather events in exoplanetary environments sourced from transient host star emissions, including stellar flares, coronal mass ejections, and stellar proton events, can substantially influence a planet's habitability and atmospheric evolution ...
Howard Chen, Paolo De Luca, Assaf Hochman, Thaddeus D. Komacek   +3 more
doaj   +1 more source

Minifilament Eruptions as the Last Straw to Break the Equilibrium of a Giant Solar Filament

The Astrophysical Journal
Filament eruptions are magnetically driven violent explosions commonly observed on the Sun and late-type stars, sometimes leading to monster coronal mass ejections that directly affect the nearby planets’ environments.
Hechao Chen, Hui Tian, Quanhao Zhang, Chuan Li, Chun Xia, Xianyong Bai, Zhenyong Hou, Kaifan Ji, Yuanyong Deng, Xiao Yang, Ziyao Hu   +10 more
doaj   +1 more source

Formation of Amino Acids and Carboxylic Acids in Weakly Reducing Planetary Atmospheres by Solar Energetic Particles from the Young Sun. [PDF]

Life (Basel), 2023
Kobayashi K, Ise JI, Aoki R, Kinoshita M, Naito K, Udo T, Kunwar B, Takahashi JI, Shibata H, Mita H, Fukuda H, Oguri Y, Kawamura K, Kebukawa Y, Airapetian VS.   +14 more
europepmc   +1 more source

Assessing natural global catastrophic risks. [PDF]

Nat Hazards (Dordr), 2023
Baum SD.
europepmc   +1 more source

Multiwavelength Sun-as-a-star Analysis of the M8.7 Flare on 2022 October 2 Using Hα and EUV Spectra Taken by SMART/SDDI and SDO/EVE

The Astrophysical Journal
This paper presents a multiwavelength Sun-as-a-star analysis of the M8.7 flare on 2022 October 2, which was associated with a filament eruption and the subsequent coronal mass ejection.
Takato Otsu, Ayumi Asai
doaj   +1 more source