June 20, 2021
June & December Solstice Comparison

Time for a Change of Seasons – 2021 June Solstice

The June Solstice for 2021 occurs on June 21st at 3:22 UTC (11:32 pm EDT on June 20th). It is the beginning of summer for the northern hemisphere and winter for the southern hemisphere.
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 22, 2014

AR12192: The Largest Sunspot Group of Solar Cycle 24

Since rotating into view, the sunspot group AR12192 has continued to grow in size and complexity, becoming the largest sunspot of the current solar cycle, cycle 24 (SC24.) The region has produced numerous C and M-class flares including an X1 flare. As
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
November 15, 2013

Coming and Going: Two Weeks of Magnetic Spots and Loops

When sunspots rotate onto the solar disk facing Earth they are identified by their structure in white or visible light. Sunspots are regions of concentrated magnetic field. They are like complicated clusters of bar magnets on their sides. Some are
February 21, 2013

A Spot with Potential

A sunspot region with potential, AR11678! Yes pun intended. This solar active region (AR for short) has emerged suddenly from under the solar photosphere (the visible “surface”) packed with magnetic potential energy and the potential for some significant flaring. It