EUVI Synchronic Maps

The EUVI synchronic maps are heliographic projections of the Extreme Ultraviolet (EUV) solar corona recorded by the Extreme UltraViolet Imager (EUVI) telescope on the two STEREO spacecraft. Images acquired simultaneously (hence, synchronic maps) from the two EUVIs are projected onto a latitude vs. Carrington longitude grid to reveal the instantaneous coverage of the solar atmosphere provide by the STEREO imagers. We also provide synchronic maps from the combination of EUVI and the Atmospheric Imaging Assembly (AIA) EUV images on the Solar Dynamics Observatory (SDO) mission. SDO/AIA records the solar corona from the Sun-Earth line thus increasing the simultaneous coverage of the solar corona when the STEREO spacecraft were at the far-side of the Sun (after about 2013) and especially after the interruption of the STEREO-B communications (since 10/2014). The map format is the same as for the EUVI-only maps.

For questions and updates please contact:

Brief Introduction

Maps are produced in four EUV wavelengths representing different 'nominal' temperatures of the coronal plasma: ~80,000 Kelvin (304 Å), 1 million K (171Å), 1.4 million K (195Å), and 1.8 million K (284 Å). Note that AIA observes in 193Å. Currently, we provide four sets of synchronic maps with slightly different formats as explained below (the map ranges are also shown):

  • NRL EUVI Only: Carrington coordinates with 6-hour cadence. At the bottom of each frame, we display the actual EUVI-A and B images and the location of the spacecraft in the inner heliosphere. The product ends with the loss of STEREO-B in September 2014.
  • NRL EUV-AIA: Same as above with the addition of AIA.
  • JPL Carrington: Carrington coordinates with 12-hour cadence to match GONG and far-side HMI seismic maps. The product is mirrored from the JPL SECCHI site (see 'Similar Links' below).
  • JPL Carrington Sinlat: Same as above but with sinlat projection (0-360° in Carrington longitude; -90° to 90° in latitude with a sine-latitude y-axis). The product is mirrored from the JPL SECCHI site.


Click on a channel below to view corresponding animations.

NRL EUVI AIA (2010/08/15 - 2015)


JPL Carrington (2010/08/15 - present) * Visual only


JPL Carrington Sinlat (2010/08/15 - present) * Visual only



Click on a channel below to view corresponding animations.

NRL EUVI-A and -B (2007/02/15 - 2014/09/27)



By default, the script loads the last available month. You can also select a date range using the drop-down above. After selecting the desired start date, click on the "Load Range" button to load the new images.

To access the entire file list, click here.

Currently viewing: Indexes to (limited to loading frames) which corresponds to (every hours) until

(range includes 100 frames following chosen date)

(by hour units)
Time:     Speed: (frames/sec)

Current Range Start:           Current Range Stop:          
Last Update:

Creative Commons LicenseThis work is licensed under a Creative Commons Attribution 3.0 License. You are free (and encouraged) to Share it (copy, distribute and transmit the work) and Remix it (adapt the work to your needs). However you should attribute our work with a mention to this website or contact. Mapping technique available on request or Solarsoft. Javascript coding attribution available in this page sourcecode.