Analysis of the Relationship Between the Solar X-Ray Radiation Intensity and the D-Region Electron Density Using Satellite and Ground-Based Radio Data
- 101 Downloads
Increases in the X-ray radiation that is emitted during a solar X-ray flare induce significant changes in the ionospheric D region. Because of the numerous complex processes in the ionosphere and the characteristics of the radiation and plasma, the causal-consequential relationship between the X-ray radiation and ionospheric parameters is not easily determined. In addition, modeling the ionospheric D-region plasma parameters is very difficult because of the lack of data for numerous time- and space-dependent physical quantities. In this article we first give a qualitative analysis of the relationship between the electron density and the recorded solar X-ray intensity. After this, we analyze the differences in the relationships between the D-region response and various X-ray radiation properties. The quantitative study is performed for data observed on 5 May 2010 in the time period between 11:40 UT – 12:40 UT when the GOES 14 satellite detected a considerable X-ray intensity increase. Modeling the electron density is based on characteristics of the 23.4 kHz signal emitted in Germany and recorded by the receiver in Serbia.
KeywordsFlares D region Electron density
The authors thank the Ministry of Education, Science and Technological Development of the Republic of Serbia through the projects III 44002 176001, 176002 and 176004. This study is made within the COST project TD1403 and the VarSITI project. We are grateful to the anonymous referee for comments and suggestions that significantly improved our paper. The authors are also grateful to Maša Lakićević for help in calculations using CHIANTI model and Janet Machol for access to data related to GOES 14 satellite calibration. The data for this paper collected by the GOES 14 satellite are available at NOAA’s National Centers for Environmental information ( http://satdat.ngdc.noaa.gov/sem/goes/data/new_full/2010/05/goes14/csv ). Requests for the VLF data can be directed to the corresponding author.
Disclosure of Potential Conflicts of Interest
The authors declare that they have no conflicts of interest.
- Ferguson, J.A.: 1998, Computer Programs for Assessment of Long-Wavelength Radio Communications, Version 2.0, Space and Naval Warfare Systems Center, San Diego. Google Scholar
- McEwan, M., Phillips, F.: 1978, Chemistry of the Atmosphere, Mir, Moscow. Google Scholar
- Morfitt, D.G., Shellman, C.H.: 1976, MODESRCH, an Improved Computer Program for Obtaining ELF/VLF Mode Constants in an Earth-Ionosphere Waveguide, Naval Electronics Lab. Center, San Diego. Google Scholar
- Wait, J.R., Spies, K.P.: 1964, Characteristics of the Earth-ionosphere waveguide for VLF radio waves, NBS Technical Note 300, Colorado. Google Scholar