Active Region

October 23, 2014

AR12192: Biggest Sunspot of Two Solar Cycles!

As of October 23, 2014, AR12192 is now the Biggest sunspot in 2 solar cycles. Just yesterday it reached the rank of largest sunspot in cycle 24. The sunspot measures a whopping 2700 microhemispheres (MH or millionths of a visible
October 19, 2014

The Big Spot Gives an X1.1 Solar Flare

Sunspot group, AR12192, released a strong burst of magnetic energy in the form of an X1.1 flare and a surge of solar plasma. The solar flare peaked in the GOES X-ray monitor at 5:01 UT, 10/19/2014. There was no significant
October 18, 2014

A Big Spot Coming into View

The active region on the southeast limb has now been designated as AR12192. This region has already produced several M and many C-class flares. Philippe Tosi of Nîmes, France, took this photograph of AR12192 on Oct. 18, 2014. The animated
February 28, 2014

SDO Spring Eclipse Season 2014

It’s that time of year. SDO spring eclipse season started February 27, 2014. During the 3 week season, Earth will pass between SDO and the Sun around 07:30 UT each day. Initially the eclipses are a few minutes long. Their
February 12, 2014

Current Solar Rumblings and Valentine’s Day Aurora

A whole lot of spots going on! We no longer have the rumbling region AR11967 but the solar disk is covered with smaller regions and AR11974 is sitting at disk center popping of lots of small and medium-sized flares. It
February 1, 2014

AR11967 Continues its Flaring and AR11968 Sends a CME Our Way

 There are two main active regions (ARs 11967/11968) on the sun and both are giving a moderate show. AR11967 continues to produce C- and M-level events, including an M3.0 flare at 07:14 UT Feb. 1, 2014. The region continues to show signs
January 28, 2014

It’s Back – AR11944 is back as AR11967

Sunspot group or active region AR11944 that gave us such a show at the beginning of the year is back. After taking its trip around the sun it has rotated onto the Earth facing solar disk and NOAA has labeled it
May 14, 2013

AR11748 Releases Yet Another X Flare – X1.2

The active region that could, has again given us an X flare! That makes 4! 12:15 UT – The NASA GSFC Space Weather Research Center has estimated that the CME may give a glancing blow to Epoxi (~5/18/2013 06:00 UT) and
November 7, 2012

Solar Activity Picks Up, Just a Bit

    An M1.7 flare peaked at 02:23 UT, November 8, 2012. This is not really a big flare but everybody’s attention picks up when the activity level reached M-class (mine included). I don’t yet know where the event came
October 10, 2012

The Sun Today for October 10, 2012

  Two new active regions could bring solar activity, one numbered (AR11589) and one not yet on the solar disk. Based on recent activity M class flares are possible from both. The region just over the limb produced an M1
June 29, 2012

Some Moderate Activity for June 28-29

Over the past 24 hours, sunspot group AR11513 has increased in complexity, producing several C-class flares and 2 M-class flares, an M2.4 on June 28 at 16:07 and an M2.2 on June 29 at 9:10 UT . Both AR11513 and
May 6, 2012
AR11476 Flaring in Multiple Wavelengths

AR11476 Comes into a Multicolored View

4 M-class Flares and More A new active region (AR11476) has been rotating into view during the beginning of May 2012. It has been producing CMEs and by May 5th it started releasing small M-class flares and lots of C-class
April 23, 2012
At 17:40 UT, the Sun produced a C2 solar flare with a radio burst and a SCORE-C CME. NASA Goddard Space Weather Center predicts it will reach Earth 4/27/2012 at 5:49 UT with only minor impact.

A Little Flare & Some Geomagnetic Activity – April 23, 2012

At 17:40 UT, the Sun produced a C2 solar flare with a radio burst and a SCORE-C CME.  NASA Goddard Space Weather Center predicts it will reach Earth 4/27/2012 at 5:49 UT with only minor impact. Currently, there is a
March 14, 2012

It Just Won’t Quit! More from AR11429!

  Sunspot group or active region AR11429 has almost rotated out of view but it still had enough energy to release an M7.9 X-ray solar flare, a fast coronal mass ejection (CME) and a solar energetic particle event (SEP). A
March 11, 2012

More Geomagnetic Storms Predicted for March 11, 2012

    CMEs are on their way to us! Estimated impact is March 11, 2012 around 2-3 PM EDT. High latitude aurora watchers keep lookout the night of March 11, 2012. On March 10, 2012, the sun produced 1 C-class
March 9, 2012

Geomagnetic Storm Picks Up! And AR11429 Flares Again!

      Nature never ceases to surprise and amaze. Just when it looked like the geomagnetic storm from yesterdays CME impacts had fizzled out, Earth’s magnetosphere continues its upset state. Even before the Kp index (a measure of the
March 7, 2012

Double Blast – Exciting Space Weather from AR11429

Sunspot group, AR11429 (Active Region), is at it again. When it first began its journey across the Earthward side of the Sun it released an M-class flare, an X-class flare and several more M flares, along with several CMEs. Early
March 6, 2012

4 M-class Flares in a Row

Sunspot group, AR11429, started off its journey across the Earth facing side of the Sun with several bangs. First it produced an M flare on March 2 at 17:29 UT (with a CME) then came another M flare (with a
March 5, 2012

3 Days of AR11429 – Lots of Activity

Sunspot group AR11429! Here is a look at AR11429 from Friday to today showing the 2 M-class and 1 X-class flare blasting away from the Sun. In addition to those events and their associated CMEs there is a lot of
February 6, 2012

Happy 10th RHESSI!

Ten years ago yesterday (5 February 2002) saw the launch of the Reuven Ramaty High-Energy Solar Spectroscopic Imager, or RHESSI (pronounced reh-see). RHESSI was designed to study particle acceleration and energy transport during solar flares by observing the highest energy
November 3, 2011

Space Weather This Week: 10/27/2011 – 11/02/2011

Solar Activity Solar activity was at low to moderate levels, with occurrences of several C-class flares and three M class flares (see the list below). Quite a few slow to moderate CMEs were detected emanating from different regions of the
May 20, 2011

Connecting the Spots (SDO Pick of the Week – May 20, 2011)

An extensive series of arcs, observed in profile, can be seen making a long distance connection between two active regions (Mar. 15-17, 2011). As SDO observed in extreme ultraviolet light, a series of magnetic field lines generated a well-defined pathway
January 10, 2011

Solar Desktop Wallpapers

We have reached the milestone of 1000 Fans on our FaceBook page! As promised, we have been preparing a small treat for all of you as a sign of appreciation for making the TheSunToday page such a great success in
December 1, 2010

Seven-Day Sun

For seven days SDO’s HMI instrument watched as a small sunspot group morphed, merged and grew into two large sunspots (Nov. 13-19, 2010) as other sunspots begin to emerge as well. We selected an image about every 15 minutes (approximately