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" ... As the Sun enters a more active part of its cycle displays of aurorae tend to intensify. The Sun’s Solar Cycle lasts around 11 years; it waxes and wanes causing a “Solar Minimum” (when there’s the lowest number of sunspots) and a “Solar Maximum” (the highest number of sunspots) during each cycle. Right now we’re moving away from “Solar Minimum,” which is now reckoned to have occurred in December 2019. ... "
" ... The great news is that Maven is performing not only exactly as expected, but in some ways is even exceeding its design efficiency, much like the Opportunity rover. The two biggest surprises are the diffuse, planet-wide aurorae, but also a phenomenon known as "transient metal layers," which is what we see when interplanetary dust collides with Mars, leaving a thin layer rich in heavy elements (mostly metals) in the upper atmosphere. As the mission continues, we're bound to learn even more. ... "
" ... The northern lights (aurora borealis) from the Arctic Circle on March 14, 2016. The rare purple... [+] color can sometimes be created in aurorae near the poles, as a combination of blue and red emission lines from atoms can create this uncommon sight along with the more typical green. Red aurorae on their own, while unusual, do occur as well, and could be reasonably described as a 'crucifix' under the right conditions. ... "
" ... When charged particles are sent towards Earth from the Sun, they are bent by Earth's magnetic field. ... [+] However, rather than being diverted away, some of those particles are funneled down along Earth's poles, where they can collide with the atmosphere and create aurorae. The largest events are driven by CMEs on the Sun, but will only cause spectacular displays on Earth if the ejected particles from the Sun have the correct component of their magnetic field anti-aligned with Earth's magnetic field. ... "