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The best of... 2017!

A  compilation  of  the  most  memorable  space  weather  moments  of  2017, featuring data, links and movies.

Proton aurora... on Mars

Scientists from the STCE have contributed to a research programme that has detected -for the first time- proton aurora on Mars. They used data gathered during the period 2004-2011 by the SPICAM ultraviolet spectrometer on board of ESA's Mars Express.

A sunspot region with ambition

Sunspot region NOAA 2172 announced itself with dynamic coronal loops towering over the solar limb, and has produced already 2 C-class flares.

The amazing coronal holes

The size and location of coronal holes are intimately related to the phase of the solar cycle, continuously giving the solar corona a different outlook in EUV over the last 10 years.

A new SC25 group?

A tiny and short-lived sunspot group at high latitude with the correct magnetic orientation of the new solar cycle was visible on 9 and 10 April. Though it did not get an official NOAA number, these "Tiny Tims" indicate that the start of SC25 is approaching

What a difference 4 years make!

The low solar activity of the last few months manifests itself also in the number of coronal mass ejections.

The battle of Takur Ghar

A combination of ionospheric anomalies and multipath effects may have caused radio outages during the intense battle of Takur Ghar on 4 March 2002, with severe consequences for the rescue mission.

How weak was SC24?

The still ongoing Solar Cycle 24 is compared to the 3 previous cycles in various domains: sunspots, solar flares, particle events, and severe geomagnetic storms. SC24 turns out to be the weakest of the lot, with significantly reduced sunspot and flaring activity as well as relatively weak and few proton and geomagnetic events.

Valentine's aurora?

A coronal mass ejection, unleashed by the Sun on 12 February, may arrive at Earth on 14 or 15 February and cause some minor to moderate geomagnetic storming.

An early solar cycle minimum?

Analysis of the most recent F10.7 cm solar flux density values hints at an early solar cycle minimum.

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