Back to Search
Start Over
Solar and lunar ionospheric electrodynamic effects during stratospheric sudden warmings.
- Source :
-
Journal of Atmospheric & Solar-Terrestrial Physics . Nov2014, Vol. 119, p138-146. 9p. - Publication Year :
- 2014
-
Abstract
- Both solar and lunar atmospheric tides are believed to drive ionospheric electrodynamic effects during stratospheric sudden warmings (SSWs), but their relative importance is not well understood. In this study, long-term records (1958–2007) of the geomagnetic field are analyzed to determine the average solar (S) and lunar (L) ionospheric current systems for SSW and non-SSW periods. It is found that the L current intensity is enhanced during SSWs approximately by 75%, while the relative change in the S current intensity is much smaller (~10%). Nonetheless, absolute changes are comparable in the S and L current intensities. At the magnetic equator, semidiurnal perturbations produced by S and L currents reinforce or cancel each other depending on the phase of the moon, creating lunar-dependent recurrent onset in the total effect. These results indicate that both S and L contributions need to be considered to understand ionospheric variability during SSWs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13646826
- Volume :
- 119
- Database :
- Academic Search Index
- Journal :
- Journal of Atmospheric & Solar-Terrestrial Physics
- Publication Type :
- Academic Journal
- Accession number :
- 98358788
- Full Text :
- https://doi.org/10.1016/j.jastp.2014.08.001