Summary of LASCO/EIT
What is LASCO?
What is EIT? (external link)
RealTime Movies (SOHO Movie Theater)
Database Queries and Download
CME Queries (New!)
FITS Header Keywords
Coronal Mass Ejections
LASCO Sky Map
LASCO C3 Planet transits (via Sungrazer)
Latest Site Updates
Team and Operations
LASCO/C1 at MPAe (Germany)
LASCO at LAS (France)
Solwind Images and CMEs
SOHO Home page
SOHO and SOHO Instruments
Other Solar Satellites and Observatories
Introduction to LASCO (and EIT)
About LASCOLASCO -- the Large Angle and Spectrometric Coronagraph -- is a set of three "coronagraph" telescopes on-board the SOHO satellite. A coronagraph is a special type of telescope that uses a solid disk ("occulter" or "occulting disk") to actually cover up the Sun itself, completely blocking direct sunlight, and allowing us to see the atmosphere around the outside of the Sun (known as the "corona").
LASCO comprises of three telescopes (C1, C2 and C3), each of which looks at an increasingly large area surrounding the Sun. For teh first year-and-a-half of the SOHO mission, all three instruments worked perectly. However, in 1998 SOHO was accidentally "lost" in space after it received a bad command. The entire spacecraft lost power and essentialy froze solid for several weeks. Eventually -- miraculously! -- the SOHO team were able to relocate the spacecraft, regain control and slowly power-up and thaw out the instruments. Sadly, the LASCO C1 camera was lost as a result of this but the rest of spacecraft came through almost completely unscathed! Eight years later -- and over ten years since launch -- LASCO C2 and C3 (and most of the rest of SOHO!) continue to work extremely well, sending back images and data on a daily basis.
About this websiteOn this site you will find a wealth of information and data from the LASCO and EIT experiments on board the ESA/NASA SOHO satellite. Here is a summary of just some of the information you will find in these pages:
Data Products:We make available all LASCO and EIT raw data in FITS format as level-0 (QuickLook), level-0.5 (LZ) and level-1 products, through our online database query form. In addition to these, we offer all the latest calibration files and monthly background images. Also available are CME lists.
Documentation:Extensive documentation is available on this site, covering all aspects of the instruments including design, specifications, operations, and performance.
Other informationLinks to external websites, to our international partners, and to solar physics projects can be found throughout this site. Additionally, at the top of each page are links to the two other main project areas we cover:
Questions?We are happy to answer any questions yuo may have about LASCO, its images, or this website. You are welcome to email the webmaster at email@example.com and we will do our very best to reply as soon as we can. (Note: please try to include the word "LASCO" in the subject line of your email) You can also check the LASCO FAQ, the sungrazer FAQ, and Dr SOHO to see if your question has been answered elsewhere.