SPACE - S0 - 20210803 - Solar Storm, Major Field Variations
Good Morning, 0bservers!
Solar winds remained relatively low but somewhat variable throughout yesterday, staying in the 360-420 KPS range throughout. It started to lower significantly around 0230 UTC, dropping to below 340 KPS but bumped back up to 380 at 0900 UTC. This is a bit odd considering the Particle Density chart, which rose significantly starting at 0900 UTC before a significant yet brief drop around 1600-1900 UTC before yet another even higher climb with another longer drop starting just before midnight UTC. Temperatures had been riding near the 5000°K before dropping nearly 800°K around 0900, and actually hitting 4000°K at 2000 UTC before a significant rise after 0200 UTC to nearly 5300°K. The Bt/Bz gaps were quite large during the afternoon and early evening before they started colliding around 2300 UTC, then gapping again for a couple of hours before a series of sustained polarity clashes for nearly 90 minutes. Naturally the Phi Angle was pretty scrambled during that period, but since the collisions have stopped the Phi Angle polarity has stabilized to the 50°-60° range. Those Particle Density elevations finally showed up on the KP-Index, where we had a KP-4 (minor geomagnetic storm) reading at 1800, followed by a KP-5 (level 1 storm), and then two more KP-4s directly afterward. By the bye, yesterday's forecast from NOAA completely missed that. We're back in the green now with a KP-2 and KP-3 as the last two readings. The Magnetometer did a pretty high spike to nearly 150 nT before dropping below 60 nT about 12 hours later (the latter number still well above the alert threshold of 40 nT). The Proton Flux and Electron Flux charts were nominal, but the latter chart did show an elevation in readings that was getting pretty close to the threshold line around 1400-1500 UTC before going back down. The X-Ray Flux showed a very small spike just above the Class B flare line around 1700. Background radiation did spend most of the day increasing steadily as well, and that too is just now reaching Class B. The coronal hole systems, both North and South, began their transit across the midpoint around 0200 UTC, and they'll be doing that most of today. The Southern hole has a longer component than the North (excluding the polar region) and will keep the flow up for at least another day. Didn't see any flaring or ejections at 131Å or 304Å, however, and that's confirmed on the LASCO C3. I am seeing something new on the Solar Visible Light image, though - a small-ish pair of dark spots, probably a newly developing sunspot group. It does show up on the Magnetogram as well as tightly clustered, probably a minimum Beta-Delta complexity. The "good" news is it is pretty far South (perhaps 60° or so) and it is well past the midpoint and already about two days from the Western lim, so unless it does something spectacularly nasty we should be good.
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