NLN Aurora Brief – October 29, 2015

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Aurora Brief Number 10 of 14
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Today on the Sun:

Today AR2436 and AR2437, both rotating out of view on the western limb, produced 3 low level C-class flares. None of them will impact Earth as they are low level, did not produce CMEs and are well outside of the Earth strike zone. Other active regions 2441 and 2442 both showed signs of growth. More exciting, a new fairly large active region is rotating onto the East limb now – it will likely be numbered tomorrow. This region seems to be what was responsible in the overall increase in background x-ray activity over the last several days. Once the region is more in view, it will be easier to classify it and determine the flare risk that it presents. Here’s an image of that spot group on Magnetogram.

Magnetogram show new active region rotating into view
Magnetogram show new active region rotating into view

There was a filament eruption around midday from the south west center disk. This eruption may have an Earth-directed component but analysis will be difficult because it happened at the same time that SDO callibration was occurring.

NLN is continuing to monitor the transequitorial coronal hole as it approaches the center point of the solar disk. This is the same active region that created aurora activity on it’s previous two rotations (September 10, October 6). On the previous rotation it produced a period of G3 storming. It has not changed much in appearance, so it is expected to put on a similar show Nov 1-3.

Big coronal hole on the Solar equator may produce aurora Nov 1-3
Big coronal hole on the Solar equator may produce aurora Nov 1-3

This Day in 2003:

Active region 486 is now the largest of Solar Cycle 23 measuring in at 2300 millionths. Adding to the already active period, it launched a second Super-X flare (X10 or higher). The CME from the previous day’s X17 flare produced major storming arrived initially with a Bz south component and elevated KP levels to 9. Bz then shifted north for the next 9 hours, despite the northward shift storming continued. At the end of the 24 hour period Bz shifted sharply south and major to extreme storming resumed.