Impulsive solar flares measuring M1.9 and M2.5 erupt near the west limb

impulsive-m1-9-solar-flare-erupts-near-the-west-limb

A moderately strong solar flare measuring M1.9 erupted from Region 2445 at 03:26 UTC on November 4, 2015. The event started at 03:20, and ended at 03:29 UTC.

A Type II Radio Emission with peak velocity of 790 km/s was associated with the event. Type II emissions occur in association with eruptions on the Sun and typically indicate a Coronal Mass Ejection is associated with a flare event.

Additionally, a 10cm Radio Burst was registered from 03:23 to 03:25 UTC, with peak flux of 220 sfu. 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.

According to SWPC, WSA Enlil analysis determined an Earth-directed component was not associated.

Image credit: NASA SDO/AIA 304.

Sunspots

There are currently 3 numbered sunspot regions on the Earth side of the Sun.

Sunspots on November 4, 2015. Image credit: NASA/SDO

2443 – Beta-Delta
2445 – Beta-Delta
2447 – Beta

Meanwhile, the geomagnetic field observed occasional levels of minor (G1-Minor) storm levels during the period as the CIR and positive polarity CH HSS interacted with Earth's magnetosphere.

The geomagnetic field is expected to be at active levels on November 4 with isolated periods of G1 (Minor) to G2 (Moderate) likely early in the day in response to high solar wind speeds. Periods of active conditions are expected to persist into November 5 and 6 as the CH HSS gradually subside.

Update:

Region 2455 erupted with an impulsive M2.5 solar flare (the second M-class of the day) at 12:03 UTC. The event started at 11:55 and ended at 12:06 UTC.

SWPC alerts:

Space Weather Message Code: SUM10R
Serial Number: 674
Issue Time: 2015 Nov 04 0401 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2015 Nov 04 0323 UTC
Maximum Time: 2015 Nov 04 0324 UTC
End Time: 2015 Nov 04 0325 UTC
Duration: 2 minutes
Peak Flux: 220 sfu
Latest Penticton Noon Flux: 124 sfu

Comment: RE-ISSUED TO UPDATE CORRECTED OBSERVATORY FINAL REPORT WITH HIGHER PEAK FLUX VALUE.

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

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: 1029
Issue Time: 2015 Nov 04 0349 UTC

ALERT: Type II Radio Emission
Begin Time: 2015 Nov 04 0323 UTC
Estimated Velocity: 790 km/s

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

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.

Featured image credit: NASA SDO/304

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