Information about STEREO-A close approach to Earth, August 2023

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:
Latest SECCHI beacon images. Plots of latest in-situ and radio beacon data SECCHI time-elongation plots ("J-plots") Comparison with helioseismology far-side data Latest images directory What planets are currently visible?		STEREO image search tool / movie maker Daily browse images and plots In-situ plots by Carrington rotation number Links to non-STEREO data Other browse tools available via the instrument data pages What to look for in STEREO images See something strange? Check here first.

COR2 Ahead, East limb

STEREO COR2 Ahead, East limb, latitude 0

STEREO COR2 Ahead, East limb, latitude -30

Plots revised: Sunday, 18-May-2025 05:05:32 UTC

COR2 Ahead, West limb

STEREO COR2 Ahead, West limb, latitude 0

STEREO COR2 Ahead, West limb, latitude -30

Plots revised: Sunday, 18-May-2025 05:05:32 UTC

HI Ahead, West limb

Plot revised: Saturday, 17-May-2025 22:30:05 UTC

Plot revised: Saturday, 17-May-2025 22:35:01 UTC

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
Amateur station DL0SHF, Kiel-Ronne, Germany
AMSAT-DL/Bochum Observatory, Germany
Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA

We would also like to acknowledge the past assistance from the following organizations:

Rutherford Appleton Laboratory: Chilbolton, UK
Centre National d'Etudes Spatiales: Toulouse, France
Korean Space Weather Center: Jeju, South Korea
National Institute of Information and Communications Technology: Koganei, Japan

In addition, we wish to acknowledge

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: Monday, 28-Oct-2024 18:36:30 UTC
Responsible NASA Official: [email address: Therese.A.Kucera<at>nasa<dot>gov]
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