39 citations · 58 across the 15 of their papers we have counts for
16 papers
Broadband 12-26 GHz Radio Radiation Reveals Evidence for Micro-flares on AU Mic
Isaiah I. Tristan, Rachel A. Osten, Yuta Notsu +2
We present sequential 12-18 and 18-26 GHz radio-band (, ) VLA observations of the 22 Myr dM1e star AU Mic. We detect two flares and two marginal events over a total of 3 con…
Enigmatic Line Broadening During Solar Flares: Magnetic Field Broadening?
Thomas Gomez, Adam Kowalski, Cole Tamburri +2
The origin of the extreme broadening observed in chromospheric metal lines during solar and stellar flares, particularly Mg II h&k and Ca II H&K, remains poorly understood. These l…
Spectroscopic analysis and RHD modeling of the first Ca II H and H-epsilon flare spectra from DKIST/ViSP
Cole Tamburri, Adam Kowalski, Gianna Cauzzi +7
We analyze decay phase observations of the GOES class C6.7 flare SOL2022-08-19T20:31 by the Visible Spectropolarimeter (ViSP) on the National Science Foundation's Daniel K. Inouye…
A 7 Day Multiwavelength Flare Campaign on AU Mic. IV: Quiescent Gyrosynchrotron and Gyroresonance Radiation from 12 to 25 GHz
Isaiah I. Tristan, Rachel A. Osten, Yuta Notsu +2
We present an analysis of the radio quiescent data from a multiwavelength campaign of the active M-dwarf flare star AU Mic (dM1e) that occurred in October 2018. Using Ku-band data…
Young M dwarfs flare activity model: Towards better exoplanetary atmospheric characterisation
E. Mamonova, A. F. Kowalski, K. Herbst +2
Context. Stellar flares can significantly influence the atmospheres and habitability of orbiting exoplanets, especially around young and active M dwarfs. Understanding the temporal…
Radio and Optical Flares on the dMe Flare Star EV Lac
Rachel A. Osten, Adam F. Kowalski, Suzanne Hawley +4
We present the results of a coordinated campaign to observe radio and optical stellar flares from the nearby M dwarf flare star EV~Lac. From a total of 27 hours of radio and 29 hou…
Discovery of multi-temperature coronal mass ejection signatures from a young solar analogue
Kosuke Namekata, Kevin France, Jongchul Chae +14
Coronal mass ejections (CMEs) on the early Sun may have profoundly influenced the planetary atmospheres of early Solar System planets. Flaring young solar analogues serve as excell…
A Seven-Day Multi-Wavelength Flare Campaign on AU Mic III: Quiescent and Flaring Properties of the X-ray Spectra and Chromospheric lines
Yuta Notsu, Isaiah I. Tristan, Rachel A. Osten +3
We present the X-ray quiescent and flaring properties from a unique, 7-day multiwavelength observing campaign on the M1 flare star AU Mic. Combining the XMM-Newton X-ray spectra wi…
Unveiling Unprecedented Fine Structure in Coronal Flare Loops with the DKIST
Cole A. Tamburri, Maria D. Kazachenko, Gianna Cauzzi +8
We present the highest-resolution H observations of a solar flare to date, collected during the decay phase of an X1.3-class flare on 8 August 2024 at 20:12 UT. Observations wit…
Flare frequency in M dwarfs belonging to Young Moving Groups
E. Mamonova, Y. Shan, A. F. Kowalski +1
Context. M stars are preferred targets for studying terrestrial exoplanets, for which we hope to obtain their atmosphere spectra in the next decade. However, M dwarfs have long bee…
Far-Ultraviolet Emission Line Investigation of Flares on AU Mic
Adalyn Gibson, Adam F. Kowalski, Adina D. Feinstein
The role of non-thermal proton energy transportation during solar and stellar flares is largely unknown; a better understanding of this physical process will allow us to rectify lo…
A 7-Day Multi-Wavelength Flare Campaign on AU Mic. II: Electron Densities and Kinetic Energies from High-Frequency Radio Flares
Isaiah I. Tristan, Rachel A. Osten, Yuta Notsu +6
M dwarfs are the most common type of star in the solar neighborhood, and many exhibit frequent and highly energetic flares. To better understand these events across the electromagn…
Rising Near-Ultraviolet Spectra in Stellar Megaflares
Adam F. Kowalski, Rachel A. Osten, Yuta Notsu +5
Flares from M-dwarf stars can attain energies up to times larger than solar flares but are generally thought to result from similar processes of magnetic energy release and…
The relationships among solar flare impulsiveness, energy release, and ribbon development
Cole A Tamburri, Maria D Kazachenko, Adam F Kowalski
We develop the impulsiveness index, a new classification system for solar flares using the SDO/EVE 304 Å Sun-as-a-star light curves. Impulsiveness classifies events based on the du…
Stellar flares
Adam F. Kowalski
Magnetic storms on stars manifest as remarkable, randomly occurring changes of the luminosity over durations that are tiny in comparison to the normal evolution of stars. These ste…
First Detection of a Strong Magnetic Field on a Bursty Brown Dwarf: Puzzle Solved
S. V. Berdyugina, D. M. Harrington, O. Kuzmychov +4
We report the first direct detection of a strong, 5 kG magnetic field on the surface of an active brown dwarf. LSR J1835+3259 is an M8.5 dwarf exhibiting transient radio and optica…