Enigmatic centi-SFU and mSFU nonthermal radio transients detected in the middle corona
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arXiv
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| Natura: | Preprint |
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2025
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| author | Mondal, Surajit Chen, Bin Yu, Sijie Chen, Xingyao Zhang, Peijin Gary, Dale Anderson, Marin M. Bowman, Judd D. Byrne, Ruby Catha, Morgan Chhabra, Sherry Addario, Larry D Davis, Ivey Dowell, Jayce Hallinan, Gregg Harnach, Charlie Hellbourg, Greg Hickish, Jack Hobbs, Rick Hodge, David Hodges, Mark Huang, Yuping Isella, Andrea Jacobs, Daniel C. Kemby, Ghislain Klinefelter, John T. Kolopanis, Matthew Kosogorov, Nikita Lamb, James Law, Casey Mahesh, Nivedita Donnell, Brian O Posner, Corey Powell, Travis Prayag, Vinand Rizo, Andres Wolf, Andrew Romero Shi, Jun Taylor, Greg Trim, Jordan Virgin, Mike Vydula, Akshatha Weinreb, Sandy White, Scott Woody, David Zentmeyer, Thomas |
| author_facet | Mondal, Surajit Chen, Bin Yu, Sijie Chen, Xingyao Zhang, Peijin Gary, Dale Anderson, Marin M. Bowman, Judd D. Byrne, Ruby Catha, Morgan Chhabra, Sherry Addario, Larry D Davis, Ivey Dowell, Jayce Hallinan, Gregg Harnach, Charlie Hellbourg, Greg Hickish, Jack Hobbs, Rick Hodge, David Hodges, Mark Huang, Yuping Isella, Andrea Jacobs, Daniel C. Kemby, Ghislain Klinefelter, John T. Kolopanis, Matthew Kosogorov, Nikita Lamb, James Law, Casey Mahesh, Nivedita Donnell, Brian O Posner, Corey Powell, Travis Prayag, Vinand Rizo, Andres Wolf, Andrew Romero Shi, Jun Taylor, Greg Trim, Jordan Virgin, Mike Vydula, Akshatha Weinreb, Sandy White, Scott Woody, David Zentmeyer, Thomas |
| contents | Decades of solar coronal observations have provided substantial evidence for accelerated particles in the corona. In most cases, the location of particle acceleration can be roughly identified by combining high spatial and temporal resolution data from multiple instruments across a broad frequency range. In almost all cases, these nonthermal particles are associated with quiescent active regions, flares, and coronal mass ejections (CMEs). Only recently, some evidence of the existence of nonthermal electrons at locations outside these well-accepted regions has been found. Here, we report for the first time multiple cases of transient nonthermal emissions, in the heliocentric range of $\sim 3-7R_\odot$, which do not have any obvious counterparts in other wavebands, like white-light and extreme ultra-violet. These detections were made possible by the regular availability of high dynamic range low-frequency radio images from the Owens Valley Radio Observatory's Long Wavelength Array. While earlier detections of nonthermal emissions at these high heliocentric distances often had comparable extensions in the plane-of-sky, they were primarily been associated with radio CMEs, unlike the cases reported here. Thus, these results add on to the evidence that the middle corona is extremely dynamic and contains a population of nonthermal electrons, which is only becoming visible with high dynamic range low-frequency radio images. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_12658 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enigmatic centi-SFU and mSFU nonthermal radio transients detected in the middle corona Mondal, Surajit Chen, Bin Yu, Sijie Chen, Xingyao Zhang, Peijin Gary, Dale Anderson, Marin M. Bowman, Judd D. Byrne, Ruby Catha, Morgan Chhabra, Sherry Addario, Larry D Davis, Ivey Dowell, Jayce Hallinan, Gregg Harnach, Charlie Hellbourg, Greg Hickish, Jack Hobbs, Rick Hodge, David Hodges, Mark Huang, Yuping Isella, Andrea Jacobs, Daniel C. Kemby, Ghislain Klinefelter, John T. Kolopanis, Matthew Kosogorov, Nikita Lamb, James Law, Casey Mahesh, Nivedita Donnell, Brian O Posner, Corey Powell, Travis Prayag, Vinand Rizo, Andres Wolf, Andrew Romero Shi, Jun Taylor, Greg Trim, Jordan Virgin, Mike Vydula, Akshatha Weinreb, Sandy White, Scott Woody, David Zentmeyer, Thomas Solar and Stellar Astrophysics Decades of solar coronal observations have provided substantial evidence for accelerated particles in the corona. In most cases, the location of particle acceleration can be roughly identified by combining high spatial and temporal resolution data from multiple instruments across a broad frequency range. In almost all cases, these nonthermal particles are associated with quiescent active regions, flares, and coronal mass ejections (CMEs). Only recently, some evidence of the existence of nonthermal electrons at locations outside these well-accepted regions has been found. Here, we report for the first time multiple cases of transient nonthermal emissions, in the heliocentric range of $\sim 3-7R_\odot$, which do not have any obvious counterparts in other wavebands, like white-light and extreme ultra-violet. These detections were made possible by the regular availability of high dynamic range low-frequency radio images from the Owens Valley Radio Observatory's Long Wavelength Array. While earlier detections of nonthermal emissions at these high heliocentric distances often had comparable extensions in the plane-of-sky, they were primarily been associated with radio CMEs, unlike the cases reported here. Thus, these results add on to the evidence that the middle corona is extremely dynamic and contains a population of nonthermal electrons, which is only becoming visible with high dynamic range low-frequency radio images. |
| title | Enigmatic centi-SFU and mSFU nonthermal radio transients detected in the middle corona |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.12658 |