New Delhi: A coronal hole high speed stream (CH HSS) was forecasted to induce a minor geomagnetic storm over the past 48 hours, but has washed over without any storming. The NOAA coronal hole #80 or SIDC Coronal Hole 126 crossed the central meridian of the Sun on 20 September. High speed streams are a steady shower of energetic particles streaming out of the Sun, from a vast region where all the magnetic field lines are aligned in a manner that propels the plasma outwards. The resulting high speed stream is not as violent, chaotic or fast as a coronal mass ejection (CME), but carry with them a portion of the tangled magnetic fields of the Sun and can cause geomagnetic storming on encountering the geomagnetic field of the Earth.

Over the next few days, the CH HSS will no longer be aimed a

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