· ·

Moderately strong M4.7 solar flare erupts from geoeffective AR 2860

m4-7-solar-flare-cme-region-2860-august-28-2021

A moderately strong solar flare measuring M4.7 at its peak erupted from geoeffective Active Region 2860 at 06:15 UTC on August 28, 2021. The event started at 05:39 and ended at 06:23 UTC.

The flare event follows increased solar activity with numerous c-class flares over the past 2 days and a C3 flare from AR2859 with an associated partial-halo coronal mass ejection (CME) on August 26. The impact from this event is expected on August 29, possibly causing G1 – Minor geomagnetic storms.

The eruption also caused a massive 'solar tsunami' — a wave of hot plasma and magnetism. "Based on the time it took to reach the next sunspot, halfway around the Sun, the tsunami was traveling faster than 177 000 km/h (110 000 mph)," said Dr. Tony Phillips of SpaceWeather.com.

Today's m-class flare was associated with a Type II radio emission (estimated velocity 276 km/s) at 06:04 UTC. 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 Type IV Radio Emission was registered at 06:15 UTC, indicating a major eruption on the Sun. Type IV emissions are typically associated with strong CMEs and solar radiation storms.

Region 2860 has Beta-Gamma magnetic configuration and is capable of producing more moderate to strong eruptions on the Sun.

Its current location favors Earth-directed CMEs. 

The solar wind environment was enhanced in 24 hours to 00:30 UTC today due to the passage of the August 23 CME, which was observed beginning at around 00:30 UTC on August 27.

Following the arrival of the aforementioned CME, wind speeds increased to around 400 km/s, total field increased to around 16 nT, and Bz was sustained southward at around -15 nT.

Earth's magnetic field was at quiet to active levels (Geomagnetic K-index <5) due primarily to the passage of the August 23 CME until 02:16 UTC on August 28 when the Geomagnetic K-Index of 5 — G1 Minor geomagnetic storm — was registered.

The levels quickly returned back to quiet.

References:

Forecast Discussion Issued: 2021 Aug 28 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center

Forecast Discussion Issued: 2021 Aug 27 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center

Solar Tsunami and CME – SpaceWeather.com – August 28, 2021

Featured image: M4.7 solar flare on August 28, 2021. Credit: NASA SDO/AIA 131

If you value what we do here, create your ad-free account and support our journalism.

Share:

Related articles

Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, select the level of your support and register your account.

Your support makes this project fully self-sustainable and keeps us independent and focused on the content we love to create and share.

All our supporters can browse the website without ads, allowing much faster speeds and a clean interface. Your comments will be instantly approved and you’ll have a direct line of communication with us from within your account dashboard. You can suggest new features and apps and you’ll be able to use them before they go live.

You can choose the level of your support.

Stay kind, vigilant and ready!

$5 /month

  • Ad-free account
  • Instant comments
  • Direct communication
  • New features and apps suggestions
  • Early access to new apps and features

$50 /year

$10 /month

  • Ad-free account
  • Instant comments
  • Direct communication
  • New features and apps suggestions
  • Early access to new apps and features

$100 /year

$25 /month

  • Ad-free account
  • Instant comments
  • Direct communication
  • New features and apps suggestions
  • Early access to new apps and features

$200 /year

You can also support us by sending us a one-off payment using PayPal:

One Comment

Leave a reply