Coronal hole this phenomenon commonly known in astronomy. The term specifies the darker areas in the Crown of the solar, related to “open” magnetic field lines. Glory corona hole there are most of the solar cycle over the poles of our star.
Glory corona holes are sources of solar wind high speed.
This in turn may cause geomagnetic storms on Earth. Although our magnetosphere is protecting us from the solar wind, in the near future will probably be observed increased activity on auroras and earth magnetometers. It is possible that with the increased activity of the solar wind, we noted problems in the operation of some satellites.
Below you can see a giant hole observed on the surface of the Sun by the Solar Dynamics Observatory on July 11 this year.