Estimating Electron Densities in the Middle Solar Corona using White-light and Radio Observations
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| Format: | Preprint |
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2026
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| author | Mondal, Surajit Shaik, Shaheda Begum Howard, Russell A. Zhang, Peijin Chen, Bin Chen, Xingyao Yu, Sijie 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 Shaik, Shaheda Begum Howard, Russell A. Zhang, Peijin Chen, Bin Chen, Xingyao Yu, Sijie 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 | The electron density of the solar corona is a fundamental parameter in many areas of solar physics. Traditionally, routine estimates of coronal density have relied exclusively on white-light observations. However, these density estimates, obtained by inverting the white-light data, require simplifying assumptions, which may affect the robustness of the measurements. Hence, to improve the reliability of coronal density measurements, it is highly desirable to explore other complementary methods. In this study, we estimate the coronal electron densities in the middle corona, between approximately $1.7-3.5R_\odot$, using low-frequency radio observations from the recently commissioned Long Wavelength Array at the Owens Valley Radio Observatory (OVRO-LWA). The results demonstrate consistency with those derived from white-light coronagraph data and predictions from theoretical models. We also derive a density model valid between 1.7--3.5 $r_\odot$ and is given by $ρ(r')=1.27r'^{-2}+29.02r'^{-4}+71.18r'^{-6}$, where $r'=r/R_\odot$, and $r$ is the heliocentric distance. OVRO-LWA is a solar-dedicated radio interferometer that provides science-ready images with low latency, making it well-suited for generating regular and independent estimates of coronal densities to complement existing white-light techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_09819 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Estimating Electron Densities in the Middle Solar Corona using White-light and Radio Observations Mondal, Surajit Shaik, Shaheda Begum Howard, Russell A. Zhang, Peijin Chen, Bin Chen, Xingyao Yu, Sijie 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 The electron density of the solar corona is a fundamental parameter in many areas of solar physics. Traditionally, routine estimates of coronal density have relied exclusively on white-light observations. However, these density estimates, obtained by inverting the white-light data, require simplifying assumptions, which may affect the robustness of the measurements. Hence, to improve the reliability of coronal density measurements, it is highly desirable to explore other complementary methods. In this study, we estimate the coronal electron densities in the middle corona, between approximately $1.7-3.5R_\odot$, using low-frequency radio observations from the recently commissioned Long Wavelength Array at the Owens Valley Radio Observatory (OVRO-LWA). The results demonstrate consistency with those derived from white-light coronagraph data and predictions from theoretical models. We also derive a density model valid between 1.7--3.5 $r_\odot$ and is given by $ρ(r')=1.27r'^{-2}+29.02r'^{-4}+71.18r'^{-6}$, where $r'=r/R_\odot$, and $r$ is the heliocentric distance. OVRO-LWA is a solar-dedicated radio interferometer that provides science-ready images with low latency, making it well-suited for generating regular and independent estimates of coronal densities to complement existing white-light techniques. |
| title | Estimating Electron Densities in the Middle Solar Corona using White-light and Radio Observations |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2602.09819 |