Wednesday, April 26, 2017

Server Maintenance - April 26, 2017

Notice. The SDO webserver will be down for maintenance today, April 26, 2017 at approximately 2:15pm. The outage for last for approximately one hour. We apologize for any inconvenience this may cause.

Today's Momentum Management Maneuver #29

Today between 1820 and 1845 UTC (2:20-2:45 pm ET) SDO will perform Momentum Management Maneuver #29. This thruster firing is used to keep the speeds of our reaction wheels within safe limits. As the wheel speeds are adjusted by their motors the thrusters fire to keep SDO pointed towards the Sun.

During this maneuver the science data from SDO may be interrupted or contain blurry images.

Tuesday, April 18, 2017

A Movie of the August 21, 2017, Lunar Transit

Here is a video showing the lunar transit SDO will see on August 21, 2017. While some in the United States will see a Total Solar Eclipse, SDO will see only a glancing transit an hour after the Moon's shadow leaves the US and goes over the Atlantic Ocean.

Monday, April 17, 2017

Today's EVE Cruciform and the Next Few Months

Today SDO is performing the EVE Cruciform. Images may be missing or blurry due to the motion of SDO. The 2017-094 SDO FDS Quarterly (LongSet) Predicts have been delivered. They extend through 2017 DOY 338. The highlights include:
  • 2017/109 (04/19) EVE FOV/ HMI/AIA Flatfield Calibration
  • 2017/116 @ 1825z (04/26 @ 1425L) - Momentum Management Maneuver (Delta-H) MM #29
  • 2017/145 @ 1824 to 1917z (05/25 @ 1424 to 1517L) - Lunar Transit
  • 2017/207 @ TBD (07/26 @ TBD) - Momentum Management Maneuver (Delta-H)MM #30 (tentative)
  • 2017/228 @ 0709z (08/16 @ 0309L) - Eclipse Season Starts
  • 2017/233 @ 1927 to 1955z (08/21 @ 1527 to 1555L) - Lunar Transit (LunTran_2017233_2dc_14pshdw)
  • 2017/242 @ TBD (08/30 @ TBD) - Stationkeeping Maneuver (Delta-V) SK #15 (tentative)
  • 2017/252 @ 0650z (09/09 @ 0250L) - Eclipse Season Ends
  • 2017/292 @ 1941 to 2025z (10/19 @ 1541 to 1625L) - Lunar Transit (LunTran_2017292_2dc_26pshdw)
With these new predicts we now think SDO will see a brief lunar transit on August 21, 2017, 1927-1955 UTC (3:27 pm ET to 3:55 pm ET). Although the Total Solar Eclipse passes over the continental US, SDO sees a brief transit 45 minutes after the Moon's shadow has moved off the coast into the Atlantic Ocean. More about this when the eclipse draws closer.

Tuesday, April 11, 2017

Website Update

Notice of upcoming change: The kiosk movies currently offered on the SDO website are being discontinued. We are launching a replacement called SDO Dashboard. Support for the kiosk product will end on April 30, 2017. The kiosk movies will be available until May 31, 2017. We are encouraging people to use our new product.

The dashboard product is located at: and is available for testing and use. The new product is similar in that is displays a looping movie of the most recent browse images. However, we are utilizing html5 video technology instead of the javascript slideshow used in the kiosks. This allows you to build your display in a drag-and-drop environment rather than a static html reference.

We are moving to html5 to satisfy website security requirements and to provide a better product. Some users have reported a noticeable flicker with the current kiosk javascript slideshow. Although we were unable to reproduce this flaw, wet concluded that it could be caused by several reasons including browser idiosyncrasies. The javascript solution also had a small memory leak. This necessitated a periodic browser refresh. Our new solution solves these issues and we are excited for the transition.