SPX vs Maximum Elongation of Mercury

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Richard Nolle (Sep 30, 2015) - Mercury Max refers to a phase in the Earth-Mercury-Sun relationship, when Mercury swings around from behind the Sun to catch up and pass the slower orbiting Earth. As it does this, Mercury draws closer and closer to our home planet, until it reaches its perigee (closest approach to Earth), coincident with what’s called the inferior Sun-Mercury conjunction. At this time, Earth, Mercury and the Sun are aligned with Mercury in the middle, passing between us and the Sun. Mercury Max is a cycle of enhanced dynamism in the Earth-Mercury-Sun relationship. It’s a time when the Sun is prone to a flurry of disturbances – strong X-Ray flares, coronal holes and Coronal Mass Ejections (CMEs). These have direct correlations here on Earth: dump Gigawatts of extra solar energy into Earth’s atmosphere and magnetosphere, and you get increased atmospheric and geomagnetic storms, and enhanced seismic activity. 

[...] The current Mercury Max cycle (the third one and final complete one this year) began with Mercury’s maximum eastern elongation on September 4, continues through the September 17 to October 9 retrograde (including the September 30 inferior conjunction with the Sun), and concludes when the little Sun-grazer reaches maximum western elongation on October 15.

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