STEREO

September 2, 2014

A Dazzling Eruption Captured by STEREO Behind

SDO and SOHO were not the only spacecraft to capture the spectacular eruption off the East (left) limb of the sun on August 24, 2014. The M5.9 flare (at 12:17 UT) from AR 12151 was seen by the STEREO SECCHI […]
November 17, 2013

Comet ISON: Coming to a Sun Near You

Current Status of Comet ISON Updated Nov. 27, 2013 – 10:40 am EST or 15:40 UT Size 1.3 mi in diameter or 2 in diameter km Date and Time of Perihelion  28 November 2013, 18:38 UT (1:38 EST) Distance from […]
May 27, 2013

Filament Eruption Sends CME Headed Towards STEREO Ahead and Mars

A filament erupted on the backside of the sun and was observed by the EUVI instrument on the STEREO Ahead spacecraft. The eruption produced a CME detected by STEREO-A COR2, STEREO-B COR2 and SOHO LASCO C3 around 19:24 UT, May […]
March 16, 2013

Waiting for a St. Patrick’s Day Aurora

Look at for Aurora tonight and tomorrow at high latitudes! Yesterday’s coronal mass ejection (CME) is expected to sweep past Earth in the last half of today (March 16, 2013) sometime around 18UT (+- 7-8 hours). Forecasts are from minor […]
November 10, 2012

Possible CME Glancing Blow on 11/13/2012 at Earth

A C-type CME was detected by STEREO-A COR2 at 5:39 UT on 11/10/2012. The estimated speed is ~900 km/s. Based on preliminary heliospheric modeling carried out at NASA GSFC Space Weather Research Center, it is estimated that the CME may […]
November 9, 2012

A Slow, Faint CME Headed to Earth

A CME is coming our way! A slow (only ~570 km/s  Type-C), faint CME was detected by LASCO and STEREO around 15:24 UT 11/09/2012 and it is heading in the direction of Earth. Computer models indicate that the leading edge […]
November 8, 2012

Two Non-Earthbound CMEs May Impact Mars and Several Spacecraft

Two CMEs (Coronal Mass Ejections) occurred in the early hours of November 8, 2012 (UT), the later one a more significant, O-type CME. The 2 CMEs are denoted with red arrows in this snapshot from the NASA Space Weather Research Center (SWRC) […]
April 23, 2012

A Little Flare and 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 small geomagnetic […]
April 22, 2012

A Prominence Eruption Sends a CME to Mercury

On April 22, 2012, filament material uncurled as an erupting prominence around sunspot group AR11463. There was a C1.8 solar flare and the resulting eruption produced a SCORE-C CME detected by SOHO/LASCO C2 at 15:30 UT.
April 17, 2012

Beautiful Eruptions from the East Limb of the Sun

An eruption of plasma from just behind the solar limb observed by SDO with the 304 Angstrom camera.This shows material at temperatures around 60,000-80,000 Kelvin. This produced a CME that went out the left side (East) of the Sun starting around 2 UT. At ~1000 km/s the CME has a SCORE O (for ordinary). NASA produced a computer model predicting the CME will impact STEREO Behind on 4/17 at 7:40 UT (but not Earth).
March 14, 2012

Unidentified Sun Object is Identified! A Little Black Spot on The Sun Today

On March 12, 2012 Sunsflare posted a video asking if anyone could identify a circular object seen in SDO coronal images. The video was also posted on Facebook with the same question posed. I answered the question on facebook but […]
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 […]