(Updated every 5 minutes or whenever new imagery is received)

Latest SOHO Spacecraft LASCO C3 Camera DIFFERENCE Image
Image generated and provided courtesy of Solar Terrestrial Dispatch.

(Updated within about 2 minutes of receiving new imagery.)

Click Here for the Last 5 Frames of Differenced Images (~800KB GIF movie)
Click Here for the Last 5 Frames (smaller size) (~300 KB GIF movie)

This image was created by subtracting the last two latest SOHO LASCO C3 images. The resulting image shows considerably more detail than the stand-alone images and allows scientists and space weather forecasters to spot locations of activity and very dim events.

White areas of the image are new coronal features that were not visible in previous C3 images. Black areas are old features.


The data stream from which these images are taken contain occasional dark frame images. These dark-frame images will be handled the same as legitimate images. As a result, you may occasionally notice minor glitches in the quality of these difference images when dark-frames appear in the stream. We will be working to remove these dark frames from the data stream in the near-future.

Also, note that the quality of these images will be inferior to those provided by the SOHO LASCO team. The reason for this is the lower quality of the data used to produce these images. These images are taken from a raw data stream and are not calibrated or preprocessed to remove cosmic ray noise or other artifacts prior to subtracting the images. As a result, the images may not be as elegant as the final images provided by the LASCO science team, but they are definitely updated more frequently.

Don't expect perfect images from this service. There will be numerous flaws in the images. This is intended to be a quick-look service only, providing very rapid near-real-time subtracted image analysis. If you want near-perfect images, wait 6 to 12 hours and try to fetch them from the SOHO science team.

Questions or comments should be sent to: STD@Spacew.Com.


To display longer movies, we recommend you obtain a copy of the Space Weather Information Monitor (SWIM) or the STD Aurora Monitor software, which can be used to automatically fetch and manage movies of these images on your computer. We do not archive old images or old movies of these images.