A very large coronal hole, spanning approximately one million kilometers, is currently visible in images of the Sun captured from space. Although the hole appears to be a bottomless chasm in the Sun, this is an illusion. In reality, it represents a significant drop in both the temperature and density of the plasma across vast areas of the solar atmosphere; these regions simply cease to emit light, creating the impression that someone has erased large portions of the Sun.
This phenomenon has almost no impact on the heat and light reaching us from the Sun, but it does significantly alter space weather. Because these regions of the solar corona are unable to effectively contain plasma, the material escapes into space at speeds of several hundred—sometimes up to a thousand—kilometers per second. If Earth, in the course of its orbit, happens to pass through such a stream, its magnetosphere typically reacts quite vigorously, primarily in the form of geomagnetic storms.
Forecasts indicate that this is precisely what will occur between Friday night and Saturday morning (November 6–7): the planet will enter a stream of high-speed solar wind originating from this coronal hole. Given the hole’s immense size, Earth is expected to remain within this stream for at least five days—lasting until the middle of next week. At present, notable geomagnetic storms are predicted for the moment the planet encounters the leading edge of this high-speed plasma stream, which is expected on the night of November 7. Beyond that, the outcome will depend on the specific characteristics of the plasma flow—details that remain unknown for now. Depending on these conditions, Earth could experience several days of geomagnetic storms, or perhaps only intermittent disturbances. Full stabilization of the magnetic field will likely not occur until the second half of next week—around November 13–14.
