Zobrazeno 1 - 10
of 168
pro vyhledávání: '"Gregory D. Fleishman"'
Autor:
Costas E. Alissandrakis, Gregory D. Fleishman, Viktor V. Fedenev, Stephen M. White, Alexander T. Altyntsev
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 122 (2024)
We report for the first time the detection of thermal free–free emission from post-flare loops at 34 GHz in images from the Nobeyama Radioheliograph. We studied eight loops, seven of which were from regions with an extremely strong coronal magnetic
Externí odkaz:
https://doaj.org/article/05aff34e81af499995c74a7e5d367a2d
Autor:
Stephen M. White, Masumi Shimojo, Kazumasa Iwai, Timothy S. Bastian, Gregory D. Fleishman, Dale E. Gary, Jasmina Magdalenic, Angelos Vourlidas
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 3 (2024)
This paper investigates the incidence of coherent emission in solar radio bursts, using a revised catalog of 3800 solar radio bursts observed by the Nobeyama Radio Polarimeters from 1988 to 2023. We focus on the 1.0 and 2.0 GHz data, where radio flux
Externí odkaz:
https://doaj.org/article/e841c78e38cd4498b3c10c4a9bbf04a2
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
This paper identifies several unsolved questions about solar flares, which can potentially be answered or at least clarified with mm/submm observations with ALMA. We focus on such questions as preflare phases and the initiation of solar flares and th
Externí odkaz:
https://doaj.org/article/63b22bd50ce64eb6b1c4c25b769f8095
Autor:
Alexandra L. Lysenko, Stephen M. White, Dmitry A. Zhdanov, Nataliia S. Meshalkina, Aleksander T. Altyntsev, Galina G. Motorina, Gregory D. Fleishman
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 122 (2023)
We identify a set of ∼100 “cold” solar flares and perform a statistical analysis of them in the microwave range. Cold flares are characterized by a weak thermal response relative to nonthermal emission. This work is a follow-up of a previous st
Externí odkaz:
https://doaj.org/article/2ef84a7984654e889513e6622b344739
Publikováno v:
The Astrophysical Journal, Vol 953, Iss 2, p 174 (2023)
Solar flares are driven by the release of free magnetic energy and its conversion to other forms of energy—kinetic, thermal, and nonthermal. Quantification of partitions between these energy components and their evolution is needed to understand th
Externí odkaz:
https://doaj.org/article/779d2bbd696341e7b5a64858418e5dbd
Autor:
Gelu M. Nita, Gregory D. Fleishman, Alexey A. Kuznetsov, Sergey A. Anfinogentov, Alexey G. Stupishin, Eduard P. Kontar, Samuel J. Schonfeld, James A. Klimchuk, Dale E. Gary
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 267, Iss 1, p 6 (2023)
To facilitate the study of solar flares and active regions, we have created a modeling framework, the freely distributed GX Simulator IDL package, that combines 3D magnetic and plasma structures with thermal and nonthermal models of the chromosphere,
Externí odkaz:
https://doaj.org/article/76a9091ab77b4b158cf6709a998d0012
Publikováno v:
The Astrophysical Journal, Vol 943, Iss 2, p 180 (2023)
We present a multiwavelength analysis of two flare-related jets on 2014 November 13, using data from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), the Reuven High Energy Solar Spectroscopic Imager (RHESSI), the Hinode/X-ray T
Externí odkaz:
https://doaj.org/article/ec6abe4622dc4838b38f667973c02a15
Publikováno v:
The Astrophysical Journal, Vol 943, Iss 2, p 160 (2023)
A strong coronal magnetic field, when present, manifests itself as bright microwave sources at high frequencies produced by the gyroresonant (GR) emission mechanism in thermal coronal plasma. The highest frequency at which this emission is observed i
Externí odkaz:
https://doaj.org/article/0465877fc59f4f4a8dd0ddd05523b28e
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 7 (2020)
Non–thermal electrons accelerated in solar flares produce electromagnetic emission in two distinct, highly complementary domains—hard X-rays (HXRs) and microwaves (MWs). This paper reports MW imaging spectroscopy observations from the Expanded Ow
Externí odkaz:
https://doaj.org/article/cde43fd0407941e0b6631084a037942a
Publikováno v:
Nature. 606:674-677
Solar flares, driven by prompt release of free magnetic energy in the solar corona1,2, are known to accelerate a substantial portion (ten per cent or more)3,4 of available electrons to high energies. Hard X-rays, produced by high-energy electrons acc