[SFDXA] Sun activity: Spectacular dark filament eruption - Earth Sky

[Bill]

  Sun activity: Spectacular dark filament eruption

Posted by C. Alex Young <https://earthsky.org/author/alexyoung/> and 
Raúl Cortés and Armando Caussade 
<https://earthsky.org/author/armandocaussade/><https://earthsky.org/author/armandocaussade/> 

July 15, 2023
An animated red globe with a fan-like spray on the bottom of the diskSun 
activity for July 14-15, 2023. AR3370 launched a dark filament 
<https://earthsky.org/sun/solar-filaments-prominences-arcs-hot-plasma/>that 
created a fan-like spray toward the west around 18:30 UTC 
<https://earthsky.org/astronomy-essentials/universal-time/>on July 14. 
Image via SDO.


      Sun activity for July 15, 2023: Spectacular dark filament eruption

*Today’s top news:* AR3370 has grabbed our attention, launching a dark 
filament 
<https://earthsky.org/sun/solar-filaments-prominences-arcs-hot-plasma/> 
that fanned out across the solar disk. The region had been rather 
inactive until it released a C8.8 flare 
<http://solar-center.stanford.edu/SID/activities/flare.html> around 
18:30 UTC <https://earthsky.org/astronomy-essentials/universal-time/> on 
July 14. This was immediately followed by the dark filament eruption 
from the eastern side of the region. This created a dark spray that 
fanned out toward the west. The spray was dark because the filament 
material was much cooler than the surrounding material. The resulting 
coronal mass ejection (CME) 
<https://earthsky.org/sun/what-are-coronal-mass-ejections/> likely has 
an Earth-directed component, but we await further analysis. We also saw 
a Type II radio burst 
<https://en.wikipedia.org/wiki/Solar_radio_emission> from an M2.2 flare 
by AR3372, which is indicative of a CME. This event may also have an 
Earthward component, and analysis is ongoing. Stay tuned!
*Last 24 hours:* Sun activity is /moderate/, with an M2.9 flare 
<http://solar-center.stanford.edu/SID/activities/flare.html> from AR3363 
along with an M1.1 and an M2.2 back-to-back from AR3372. The sun also 
produced 19 C flares 
<http://solar-center.stanford.edu/SID/activities/flare.html> between 11 
UTC yesterday and 11 UTC today. The M2.9, which was fired at 7:21 UTC 
<https://earthsky.org/astronomy-essentials/universal-time/> on July 15, 
caused an R1 <https://www.swpc.noaa.gov/noaa-scales-explanation> (minor) 
radio blackout 
<https://www.swpc.noaa.gov/phenomena/solar-flares-radio-blackouts> over 
southeast Asia and the Indian Ocean. AR3363 was the day’s leading flare 
producer, with the M2.9 and ten Cs. The sun currently has eight labeled 
active regions on its Earth-facing side.
*Next 24 hours:* The forecast is a 99% chance for C flares, a 50% chance 
for M flares, and a 10% chance for X flares.
*Next expected CME: * No Earth-directed coronal mass ejections (CMEs 
<https://earthsky.org/sun/what-are-coronal-mass-ejections/>) were 
confirmed in available imagery, but two events are under analysis.
*Current geomagnetic activity:* Earth’s magnetic field is quiet as of 11 
UTC <https://earthsky.org/astronomy-essentials/universal-time/> on July 
15. Intermittent G1 <https://www.swpc.noaa.gov/noaa-scales-explanation> 
(minor) geomagnetic storming 
<https://earthsky.org/sun/definition-what-is-a-geomagnetic-storm/>is 
likely today due to CME effects and fast solar wind 
<https://www.swpc.noaa.gov/phenomena/solar-wind> from a coronal hole 
<https://www.swpc.noaa.gov/phenomena/coronal-holes>. These effects 
should weaken on July 16, with only isolated active periods. Quiet 
conditions are then expected on July 17, pending the modeling results 
from July 14 CME events.

An almost complete red circle show the sun ejecting dark plasma.July 14, 
2023. The dark filament that exploded at around 18:30 UTC on July 14. 
Its dark ejecta can be seen going out into space over the solar horizon. 
GOES-18 SUVI AIA 304 Angstrom. Image via NOAA <https://www.swpc.noaa.gov/>.

Two sectional yellow spheres, side-by-side, representing the sun.View at 
EarthSky Community Photos 
<https://earthsky.org/earthsky-community-photos/entry/60045/>. | David 
Hoskin 
<https://earthsky.org/earthsky-community-photos?filter_1_3=David&filter_1_6=Hoskin&mode=all> 
in Halifax, Nova Scotia, Canada, captured these filtered views of the 
sun on July 13, 2023. David wrote: “White light (left) and 
hydrogen-alpha filtered images of sunspot group AR3372 that just came 
into view on the northeast limb of the sun, imaged on 13 July. AR3372 
has already been the source of several strong M-class 
<http://solar-center.stanford.edu/SID/activities/flare.html> solar 
flares.” Thank you, David!

The sun, seen as a large yellow sphere with dark spots, each 
labeled.This image shows sun activity – with the most active regions 
labeled – as of 4 UTC 
<https://earthsky.org/astronomy-essentials/universal-time/> on July 15, 
2023. Original image, without labels, via NASA SDO. Courtesy of NASA/SDO 
and the AIA, EVE, and HMI science teams, with labeling by EarthSky. 
Today’s sun is posted by Armando Caussade 
<https://earthsky.org/author/armandocaussade/>. Why are east and west on 
the sun reversed 
<https://earthsky.org/sun/east-and-west-on-the-sun-reversed/>?

https://earthsky.org/sun/sun-activity-solar-flare-cme-aurora-updates/?mc_cid=19a1c0c748&mc_eid=fbac876af9

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