Zobrazeno 1 - 10
of 515
pro vyhledávání: '"Bortnik, Jacob"'
Autor:
Cohen, Ian J., Baker, Dan, Bortnik, Jacob, Brandt, Pontus, Burch, Jim, Caspi, Amir, Clark, George, Cohen, Ofer, DeForest, Craig, Emslie, Gordon, Gkioulidou, Matina, Halford, Alexa, Higginson, Aleida, Jaynes, Allison, Klein, Kristopher, Kletzing, Craig, McGranaghan, Ryan, Miles, David, Nikoukar, Romina, Nykyrii, Katariina, Paxton, Larry, Prockter, Louise, Spence, Harlan, Swartz, William H., Turner, Drew L., Westlake, Joe, Whittlesey, Phyllis, Wiltberger, Michael
Publikováno v:
Bulletin of the AAS, Vol. 55, Issue 3, Whitepaper #071 (6pp); 2023 July 31
The field of Heliophysics has a branding problem. We need an answer to the question: ``What is Heliophysics\?'', the answer to which should clearly and succinctly defines our science in a compelling way that simultaneously introduces a sense of wonde
Externí odkaz:
http://arxiv.org/abs/2308.12308
Tsunamis can trigger internal gravity waves (IGWs) in the ionosphere, perturbing the Total Electron Content (TEC) - referred to as Traveling Ionospheric Disturbances (TIDs) that are detectable through the Global Navigation Satellite System (GNSS). Th
Externí odkaz:
http://arxiv.org/abs/2308.04611
Autor:
Ma, Donglai, An, Xin, Artemyev, Anton, Bortnik, Jacob, Angelopoulos, Vassilis, Zhang, Xiao-Jia
Electron acoustic waves (EAWs), as well as electron-acoustic solitary structures, play a crucial role in thermalization and acceleration of electron populations in Earth's magnetosphere. These waves are often observed in association with whistler-mod
Externí odkaz:
http://arxiv.org/abs/2308.03938
We investigate the response of outer radiation belt electron fluxes to different solar wind and geomagnetic indices using an interpretable machine learning method. We reconstruct the electron flux variation during 19 enhancement and 7 depletion event
Externí odkaz:
http://arxiv.org/abs/2307.09192
Autor:
An, Xin, Artemyev, Anton, Angelopoulos, Vassilis, Zhang, Xiao-Jia, Mourenas, Didier, Bortnik, Jacob, Shi, Xiaofei
Publikováno v:
Journal of Geophysical Research: Space Physics, 129, e2023JA031863
Electromagnetic ion cyclotron (EMIC) waves lead to rapid scattering of relativistic electrons in Earth's radiation belts, due to their large amplitudes relative to other waves that interact with electrons of this energy range. A central feature of el
Externí odkaz:
http://arxiv.org/abs/2307.03795
Autor:
Ma, Donglai, Bortnik, Jacob, Chu, Xiangning, Claudepierre, Seth G., Kellerman, Adam, Ma, Qianli
Many Machine Learning (ML) systems, especially neural networks, are fundamentally regarded as black boxes since it is difficult to grasp how they function once they have been trained. Here, we tackle the issue of the interpretability of a high-accura
Externí odkaz:
http://arxiv.org/abs/2208.08905
Autor:
An, Xin, Artemyev, Anton, Angelopoulos, Vassilis, Zhang, Xiaojia, Mourenas, Didier, Bortnik, Jacob
Publikováno v:
Physical Review Letters 129, 135101 (2022)
Electromagnetic ion cyclotron waves are expected to pitch-angle scatter and cause atmospheric precipitation of relativistic ($> 1$ MeV) electrons under typical conditions in Earth's radiation belts. However, it has been a longstanding mystery how rel
Externí odkaz:
http://arxiv.org/abs/2206.08483
Autor:
Grach, Veronika S., Artemyev, Anton V., Demekhov, Andrei G., Zhang, Xiao-Jia, Bortnik, Jacob, Angelopoulos, Vassilis, Nakamura, R., Tsai, E., Wilkins, C., Roberts, O. W.
Relativistic electron losses in Earth's radiation belts are usually attributed to electron resonant scattering by electromagnetic waves. One of the most important wave mode for such scattering is the electromagnetic ion cyclotron (EMIC) mode. Within
Externí odkaz:
http://arxiv.org/abs/2205.00515
Autor:
Chu, Xiangning, Ma, Donglai, Bortnik, Jacob, Tobiska, W. Kent, Cruz, Alfredo, Bouwer, S. Dave, Zhao, Hong, Ma, Qianli, Zhang, Kun, Baker, Daniel N., Li, Xinlin, Spence, Harlan, Reeves, Geoff
We present a machine-learning-based model of relativistic electron fluxes >1.8 MeV using a neural network approach in the Earth's outer radiation belt. The Outer RadIation belt Electron Neural net model for Relativistic electrons (ORIENT-R) uses only
Externí odkaz:
http://arxiv.org/abs/2109.10532
Autor:
Ma, Donglai, Chu, Xiangning, Bortnik, Jacob, Claudepierre, Seth G., Tobiska, W. Kent, Cruz, Alfredo, Bouwer, S. Dave, Fennell, J. F., Blake, J. B.
Publikováno v:
Space Weather, 20, e2022SW003079
We present a set of neural network models that reproduce the dynamics of electron fluxes in the range of 50 keV $\sim$ 1 MeV in the outer radiation belt. The Outer Radiation belt Electron Neural net model for Medium energy electrons(ORIENT-M) uses on
Externí odkaz:
http://arxiv.org/abs/2109.08647