Solar flare reaching X1.0 erupted from southwest limb

solar-flare-reaching-x1-0-erupted-from-southwest-limb

Solar flare peaking as X1.04 erupted from Sun's southwest limb at 10:26 UTC on November 19, 2013. This event was observed around 'beta-delta' classified AR 1893. 

A Type II Radio Emission was registered at 10:24 UTC with estimated velocity of 1049 km/s.  Type II emissions occur in association with eruptions on the Sun and typically indicate a coronal mass ejection is associated with a flare event. A 10 cm Radio Burst event (TenFlare) was observed from 10:20 – 10:27 UTC (7 minutes) with peak flux of 530 sfu.

Based on the location of AR 1893, any coronal mass ejection (CME) associated with this event is likely to be too far west to have a significant impact on Earth, but further analysis will be accomplished once imagery becomes available.

Space Weather Message Code: SUMX01
Serial Number: 95
Issue Time: 2013 Nov 19 1104 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2013 Nov 19 1014 UTC
Maximum Time: 2013 Nov 19 1026 UTC
End Time: 2013 Nov 19 1034 UTC
X-ray Class: X1.0
Optical Class: sf
Location: S14W71
NOAA Scale: R3 – Strong
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio – Wide area blackout of HF (high frequency) radio communication for about an hour.

***

Space Weather Message Code: SUM10R
Serial Number: 599
Issue Time: 2013 Nov 19 1102 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2013 Nov 19 1020 UTC
Maximum Time: 2013 Nov 19 1021 UTC
End Time: 2013 Nov 19 1027 UTC
Duration: 7 minutes
Peak Flux: 530 sfu
Latest Penticton Noon Flux: 163 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

***

Space Weather Message Code: ALTTP2
Serial Number: 895
Issue Time: 2013 Nov 19 1042 UTC

ALERT: Type II Radio Emission
Begin Time: 2013 Nov 19 1024 UTC
Estimated Velocity: 1049 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

***

Space Weather Message Code: ALTXMF
Serial Number: 204
Issue Time: 2013 Nov 19 1023 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2013 Nov 19 1022 UTC
NOAA Scale: R2 – Moderate
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/drap/index.html.

Sunspots

There are currently 8 numbered sunspot regions on the disk. In last 24 hours Regions 1897 (S17W36, Fso/beta-gamma) and 1900 (S21W74, Dsc/beta) combined with Region 1893 produced the majority of flares, mostly C-class. The remaining active regions were stable and unremarkable and no Earth-directed CMEs were observed. A back-sided CME was observed on the southeast limb in Lasco C2 imagery at approximately 04:24 UTC today.

Sunspots on November 19, 2013. (NASA/SDO/HMI)

1893 S13W66 102 480 12 EKI 15 BD
1895 S16W42 78 40 1 HSX 1 A
1896 N10W32 67 100 2 HSX 1 A
1897 S19W29 65 100 19 FAI 28 BG
1899 N04W04 39 610 7 HKX 6 A
1900 S21W67 102 70 5 DAI 10 B
1902 N20W47 83 10 1 AXX 1 A
1903 S11E63 332 140 2 HSX 2 A

Active region 1893

This 'beta-delta' class region is about to rotate onto the southwest limb. CME's from that region should be directed away from Earth.

Featured image: NASA SDO AIA 304

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