A strong geomagnetic storm is in progress since yesterday at 12:15 UTC after the impact of a coronal mass ejection (CME). Analysts of the Goddard Space Weather expect ”strong compression of the magnetosphere” and the possibility that satellites in geostationary orbit are exposed to the plasma of the solar wind and strong magnetic fields. At mid-high latitudes should be visible auroras after nightfall.
The general conditions of propagation should undergo some deterioration,accentuated in the polar regions, as indicated by the following STORM graph.
STORM is an ionospheric correction model that allows to correct the critical frequency of F layer (foF2) and is useful for users HF. During a geomagnetic storm the foF2 can be reduced or increased. When the foF2 has increased, you can use higher frequencies, enabling a reduction of absorption and an increase in received signal strength. If the foF2 is reduced, the maximum frequency used must be reduced to ensure the reflection of the radio signal from the ionosphere. The amount of correction needed is perceived from the color of the lines according to latitude and hemisphere.
Photo Credit: NASA/Martin Stojanovski