Zobrazeno 1 - 10
of 284
pro vyhledávání: '"Stefan, John"'
Autor:
Kasapis, Spiridon, Kitiashvili, Irina N., Kosovichev, Alexander G., Stefan, John T., Apte, Bhairavi
To create early warning capabilities for upcoming Space Weather disturbances, we have selected a dataset of 61 emerging active regions, which allows us to identify characteristic features in the evolution of acoustic power density to predict continuu
Externí odkaz:
http://arxiv.org/abs/2402.08890
The first significant sunquake event of Solar Cycle 25 was observed during the X1.5 flare of May 10, 2022, by the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory. We perform a detailed spectro-polarimetric analysis of th
Externí odkaz:
http://arxiv.org/abs/2309.07346
Autor:
Sadykov, Viacheslav, Stefan, John, Kosovichev, Alexander, Allred, Joel, Kerr, Graham S, Stejko, Andrey, Kowalski, Adam
SDO/HMI observations reveal a class of solar flares with substantial energy and momentum impacts in the photosphere, concurrent with white-light emission and helioseismic responses, known as sunquakes. Previous radiative hydrodynamic modeling has dem
Externí odkaz:
http://arxiv.org/abs/2306.13162
Autor:
Stefan, John, Kosovichev, Alexander
We investigate deviations in the mean phase travel time of acoustic waves preceding the emergence of 46 large active regions observed by the Helioseismic and Magnetic Imager (HMI). In our investigation, we consider two different procedures for obtain
Externí odkaz:
http://arxiv.org/abs/2212.05959
Recent work published by Lindsey et al find evidence for a deep and compact seismic source for the sunquake associated with the 2011 July 30 M9.3 flare, as well as seismic emission extending up to 10 mHz. We examine the sunquake independently, and a
Externí odkaz:
http://arxiv.org/abs/2209.11286
A time-distance measurement technique is derived to isolate phase travel time anisotropy caused by subsurface horizontal magnetic fields, and a method which uses the measured anisotropy to estimate the field's orientation is also derived. A simulatio
Externí odkaz:
http://arxiv.org/abs/2203.03495
Autor:
Stefan Kluge, Alexander Zarbock, Patrick Meybohm, Christian Putensen, Stefan Hagel, Mathias W Pletz, Michael Bauer, Christian Jung, Markus A Weigand, Thorsten Brenner, Markus Heim, Stefan Münster, Sven Bercker, Sandra Fiedler, Frank Bloos, Maria Deja, Christian Ertmer, Peter Rosenberger, Helene Häberle, Jochen Dutzmann, Charlotte Ling, Andreas Güldner, Johannes Ehler, Sebastian Weis, Nicole Brillinger, Sebastian Decker, Philipp Franken, Alexander Vogt, Tobias Lahmer, Silke Fortenbach, Stefan John, Marc M. Berger, Axel Nierhaus, Friedhelm Bach, Raphael Bruno, Michael Zoller, Sandra Frank, Sarah Müller, Markus Feußner, Heinrich V Groesdonk, Ulrich Frey, Jan-Martin Wischermann, Mareike Otto, Matthias Lindner, Jan Heyckendorf, Caterina Reuchsel, Bernd Reichmann
Publikováno v:
BMJ Open, Vol 14, Iss 4 (2024)
Introduction Herpes simplex virus (HSV) is frequently detected in the respiratory tract of mechanically ventilated patients and is associated with a worse outcome. The aim of this study is to determine whether antiviral therapy in HSV-positive patien
Externí odkaz:
https://doaj.org/article/c84813873bba43d0993e3e14947b10fa
A time-distance helioseismic technique, similar to the one used by Ilonidis et al (2011), is applied to two independent numerical models of subsurface sound-speed perturbations to determine the spatial resolution and accuracy of phase travel time shi
Externí odkaz:
http://arxiv.org/abs/2012.01367
Autor:
Nita, Gelu, Georgoulis, Manolis, Kitiashvili, Irina, Sadykov, Viacheslav, Camporeale, Enrico, Kosovichev, Alexander, Wang, Haimin, Oria, Vincent, Wang, Jason, Angryk, Rafal, Aydin, Berkay, Ahmadzadeh, Azim, Bai, Xiaoli, Bastian, Timothy, Boubrahimi, Soukaina Filali, Chen, Bin, Davey, Alisdair, Fereira, Sheldon, Fleishman, Gregory, Gary, Dale, Gerrard, Andrew, Hellbourg, Gregory, Herbert, Katherine, Ireland, Jack, Illarionov, Egor, Kuroda, Natsuha, Li, Qin, Liu, Chang, Liu, Yuexin, Kim, Hyomin, Kempton, Dustin, Ma, Ruizhe, Martens, Petrus, McGranaghan, Ryan, Semones, Edward, Stefan, John, Stejko, Andrey, Collado-Vega, Yaireska, Wang, Meiqi, Xu, Yan, Yu, Sijie
The authors of this white paper met on 16-17 January 2020 at the New Jersey Institute of Technology, Newark, NJ, for a 2-day workshop that brought together a group of heliophysicists, data providers, expert modelers, and computer/data scientists. The
Externí odkaz:
http://arxiv.org/abs/2006.12224
Publikováno v:
ApJ 895 65 (2020)
Sunquakes are one of the more distinct secondary phenomena related to solar flares, where energy deposition in the lower layers of the Sun's atmosphere excites acoustic waves easily visible in Helioseismic and Magnetic Imager (HMI) dopplergrams. We e
Externí odkaz:
http://arxiv.org/abs/1911.06839