STEREO - Solar Terrestrial Relations Observatory
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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 plots.

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.

Realtime resources:     Browse resources:

COR2 Ahead, East limb

STEREO COR2 Ahead, East limb, latitude +30

STEREO COR2 Ahead, East limb, latitude 0

STEREO COR2 Ahead, East limb, latitude -30

Plots revised: Tuesday, 19-Mar-2024 02:47:51 EDT

COR2 Ahead, West limb

STEREO COR2 Ahead, West limb, latitude +30

STEREO COR2 Ahead, West limb, latitude 0

STEREO COR2 Ahead, West limb, latitude -30

Plots revised: Tuesday, 19-Mar-2024 02:47:51 EDT

HI Ahead, West limb

STEREO HI2 Ahead, East limb, latitude 0

Plot revised: Monday, 18-Mar-2024 08:06:17 EDT

STEREO HI1 Ahead, East limb, latitude 0

Plot revised: Tuesday, 19-Mar-2024 01:29:45 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 organizations:

  • NASA Deep Space Network
  • National Institute of Information and Communications Technology: Koganei, Japan
  • Amateur station DL0SHF, Kiel-Ronne, Germany
  • AMSAT-DL/Bochum Observatory, Germany
  • Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
  • Korean Space Weather Center, Jeju, South Korea

We would also like to acknowlege the past assistance from the following organizations:
  • Rutherford Appleton Laboratory: Chilbolton, UK
  • Centre National d'Etudes Spatiales: Toulouse, France

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: Wednesday, 08-Dec-2021 11:01:37 EST
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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