Important notice about STEREO Behind
SECCHI Time-Elongation Plots
Below are time-elongation plots built up from SECCHI running difference
images, known colloquially by some as "J-plots". Coronal mass ejections
(CMEs) are seen as diagonal bright and dark bands running from lower-left to
upper-right. The steepness of the band reflects the speed of the CME.
Occasionally one can also see planets or bright stars as streaks in the
These plots are built up from the SECCHI beacon images. The STEREO space
weather beacon telemetry mode is a very low rate, highly compressed data stream
broadcast by the spacecraft 24 hours per day. These data are used for space
weather forecasting. Because of the large compression factors used, these
beacon images are of much lower quality than the actual science data.
COR2 Ahead, East limb
Plots revised: Tuesday, 24-May-2016 19:17:30 EDT
COR2 Ahead, West limb
Plots revised: Tuesday, 24-May-2016 19:17:31 EDT
HI Ahead, West limb
Plot revised: Tuesday, 24-May-2016 14:22:59 EDT
Plot revised: Tuesday, 24-May-2016 17:51:32 EDT
This page should automatically update every 5 minutes. Otherwise, use your
browser's "reload" button to get the most recent plot.
The data on this page include telemetry collected by the following
We would also like to acknowlege the past assistance from the following
- NASA Deep Space Network
- National Institute of Information and Communications Technology: Koganei,
- Centre National d'Etudes Spatiales: Toulouse, France
- Amateur station DL0SHF, Kiel-Ronne, Germany
- AMSAT-DL/Bochum Observatory, Germany
- Rutherford Appleton Laboratory: Chilbolton, UK
In addition, we wish to acknowlege
- Amateur station KA9Q, Phil Karn, for writing and donating the decoding
software used at the ground stations.
- NOAA Space Weather Prediction Center for organizing and scheduling the
ground station network.
Last Revised: Thursday, 28-Jan-2016 17:24:50 EST
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Feedback and comments: webmaster