STUDYING 630 NM ATOMIC OXYGEN EMISSION SOURCES DURING STRONG MAGNETIC STORMS IN THE NIGHT MID-LATITUDE IONOSPHERE
Journal Title: Solar-Terrestrial Physics - Year 2019, Vol 5, Issue 2
Abstract
We analyze significant increases in 630 nm atomic oxygen night emissions during very strong geomagnetic storms, using optical measurements, theoretical modeling, and magnetogram inversion technique (MIT) data. It is shown that during strong magnetic storms when electron precipitation equatorial boundary at the night sector expands up to ~40°, the interaction of energetic electron flux with thermospheric components may cause extreme increases in the 630 nm emission intensity. Model calculations of the red line intensity show good agreement with observational data. Using the November 20, 2003 magnetic storm as an example, we have found that oxygen atom collisions with thermal Maxwell and superthermal electrons make a major contribution to the integral emission intensity. Thermospheric density variations during the magnetic storm significantly affect the red line generation.
Authors and Affiliations
Leonovich L. A. , Tashchilin A. V. , Lunyushkin S. B. , Karavaev Y. A. , Penskikh Y. V.
GEOMAGNETIC METHOD FOR AUTOMATIC DIAGNOSTICS OF AURORAL OVAL BOUNDARIES IN TWO HEMISPHERES OF EARTH
The ground-based automatic method for determining auroral oval (AO) boundaries developed by the authors [Lunyushkin, Penskikh, 2019] has been modified and expanded to the Southern Hemisphere. Input data of the method con...
SECOND-ORDER PERTURBATIONS IN ALFVÉN WAVES IN FINITE PRESSURE PLASMA
It is shown first that in finite pressure plasma, just as in cold plasma, Alfvén waves created by an initial perturbation generate plasma flows and decreases in the magnetic field, which propagate along with these waves....
Application of convolution neural networks for critical frequency fₒF2 prediction
Ionosphere has an important impact on the quality of radio communication, radar, and global positioning. One of the essential characteristics describing the state of the ionosphere is its critical frequency fₒF2. Its pre...
PARTIAL PONDEROMOTIVE FORCES OF ALFVÉN WAVES IN NEAR-EARTH PLASMA
In the study of the ponderomotive action of Alfvén waves on near-Earth plasma, the general formula for ponderomotive forces, known in classical electrodynamics of continuous media, was previously used. The formula does n...
DEFINITION OF THE ALFVÉN MODE IN INHOMOGENEOUS MAGNETIC FIELD
The article is methodological and defines the concept of the linear Alfvén mode. There are two definitions — electrodynamic and hydrodynamic. In the former, the Alfvén mode is considered a wave with a potential transvers...