SPACE - S0 - 20210906 - Grand Sunspots, Solar Forcing, Electric Space Aggregate
Happy Labo(u)r Day, 0bservers!
Solar wind speeds dropped precipitously around 1100 UTC on Saturday from a peak of 450 KPS to a low of 340 KPS, approaching 400 KPS again around midnight UTC before dropping and stabilizing along the 300 KPS line by 1600 UTC yesterday. It did bump up to 330 KPS around 0430 UTC today and steadied at 320 KPS. Temperatures followed the wind speed track, reducing from a high of 5400°K midday UTC Saturday to a current 4200°K-4400°K range at 1000 UTC today. Particle Density was mostly steady from Saturday midday UTC, although there was a noticeable increase starting around 1330 UTC yesterday for four hours before reducing and stabilizing again. This appears to have been driven by some Phi Angle instability, itself driven by a series of polarity collisions on the Bt/Bz chart, followed by a wide gap (and Phi Angle stabilization) before another collision around 0330 UTC which caused yet another shift. KP-Index readings stayed in the green, with just two increases to KP-3 but otherwise in the lower levels. The Magnetometer seems to finally be back in a stable, nominal sine wave pattern after last week's repeated dips to the threshold level. The Proton Flux chart is nominal, but the Electron Flux has shown one brief foray above the alert line for a couple of hours yesterday afternoon UTC before returning to safer levels. X-Ray Flux levels stayed in the mid-to-upper Class B flare range. I did see from the video loop at 193Å a strong pop around 1745-1800 UTC yesterday from the trailing edge of the Northern sunspot group (not quite at the midpoint). It displayed as a flare at 131Å, but didn't seem to expel X-Rays. The Southern coronal hole is now crossing the centerline. There's a lot of action at both lims of the disc visible at 304Å, as well as some sparking from the incoming sunspots in the South. The Magnetogram from SOHO is pretty messy, with three distinct sunspots in the South and a pair of more diffuse ones North of the equator. All of them at least Beta complexity, and the two stronger Southern ones are still approaching the strike range of Earth, but they're not as magnetically complex as the other Southern one. The Northern one is pretty diffuse. They're also all showing up on the Solar Visible Light loop as well.
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