M1.1 solar flare from behind the east limb

Saturday, 21 October 2017 - 08:36 UTC

M1.1 solar flare from behind the east limb

A huge surprise last evening as solar activity unexpectedly reached moderate level thanks to an M1.11 (R1-minor) solar flare that took place behind the east limb. The solar flare peaked at 23:28 UTC on 20 October 2017.

The solar flare was associated with a Type II Radio Emission and a slow coronal mass ejection that of course isn't directed towards our planet. Source of the solar flare seems to be the same area that was responsible for a double eruption back on 18 October. This area used to be the home of sunspot region 2673 two rotations ago (yes that is indeed the sunspot region that produced four X-class solar flares) and sunspot region 2682 during the previous rotation. It looks like this sunspot region is back for a third time and somehow became active again! Exciting! There is only 1 small sunspot visible right now so if there are more spots hiding behind the limb they should become visible in the near future. The SDO website is down at the moment so it's hard to get up to date imagery but we hope they will come back online soon.

Image: SOHO LASCO C2 difference frame showing the M1.1 coronal mass ejection as it is ejected into space. The plasma cloud is not directed towards Earth.

Thank you for reading this article! Did you had trouble with some of the technical terms used in this article? Our help section is the place to be where you can find in-depth articles, a FAQ and a list with common abbreviations. Still puzzled? Just post on our forum where we will help you the best we can! Never want to miss out on a space weather event or one of our news articles again? Subscribe to our mailing list, follow us on Twitter and Facebook and download the SpaceWeatherLive app for Android and iOS!

Current data suggest that it is not possible to see aurora now at middle latitudes

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

100%

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2018/10/13Kp5 (G1)
Number of spotless days in 2018:167
Current stretch spotless days:3

This day in history*

Solar flares
12012M9.0
22014M4.5
32014M3.9
42004M2.6
52003M1.9
ApG
1200336G2
2199534G2
3201424G1
4199822G1
5199616
*since 1994

Social networks