English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Features of Radio-Brightness Distribution over the Solar Disk at Millimeter Waves: Models and Observations

Nagnibeda, V. G., Topchilo, N. A., Loukitcheva, M., & Rakhimov, I. A. (2021). Features of Radio-Brightness Distribution over the Solar Disk at Millimeter Waves: Models and Observations. Geomagnetism and Aeronomy, 61, 1150-1158. doi:10.1134/S001679322108017X.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Nagnibeda, V. G., Author
Topchilo, N. A., Author
Loukitcheva, Maria1, Author           
Rakhimov, I. A., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

Content

show
hide
Free keywords: -
 Abstract: Millimeter emission of the quiet Sun is generated entirely in the chromosphere and therefore can serve as a convenient tool for chromospheric plasma diagnostics. This paper presents model calculations of the radio-brightness distribution over the solar disk to test two chosen versions of a modern, realistic, spatially inhomogeneous, three-dimensional model of the chromosphere based on the Bifrost code (Carlsson et al., 2016). Comparison of the calculated and observed data demonstrates agreement: the disk brightness (on average, without small-scale fluctuations reflecting the inhomogeneity of the chromosphere) remains constant up to distances of around 0.95 of the solar radius from the disk center. The model brightness at the limb does not exceed twice the brightness of the disk center, with no significant brightening immediately behind the limb. At the same time, the model values of the radio radius, which characterize the height of the chromosphere, turn out to be much smaller than the observed values available in the literature. This discrepancy (an underestimated value of the radio radius) may be due the fact that a number of physical processes are not taken into account in 3D models, e.g., the LTE assumption (Martínez-Sykora et al., 2020). Conversely, the observed values of the radio radius may be overestimated, as evidenced by our recent eclipse measurements in 2020.

Details

show
hide
Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1134/S001679322108017X
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Geomagnetism and Aeronomy
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington [etc.] : American Geophysical Union
Pages: - Volume / Issue: 61 Sequence Number: - Start / End Page: 1150 - 1158 Identifier: ISSN: 0016-7932
CoNE: https://pure.mpg.de/cone/journals/resource/110978977279196