SDO
9th February 2011, 15:00
http://1.bp.blogspot.com/_WtzQ3UDWZR8/TVKpsteKsPI/AAAAAAAAAEQ/75R_qYCOV7Q/s200/thruster_firing.jpeg (http://1.bp.blogspot.com/_WtzQ3UDWZR8/TVKpsteKsPI/AAAAAAAAAEQ/75R_qYCOV7Q/s1600/thruster_firing.jpeg)
At 1940 UT (2:40 pm ET) on February 9, 2011 SDO will execute a Delta-H maneuver. This is a planned activity. Science data will be interrupted for about 30 minutes. The actual duration will be determined by the onboard software as it changes the reaction wheel speeds and fires the thrusters of the spacecraft to complete the maneuver. The goal is to adjust the reaction wheel speeds so we can maintain the pointing of the spacecraft over the next few months.
Here is a picture of a test thruster being fired on the ground in 2006 (we cannot see the actual thrusters on the spacecraft.) The thrusters should fire for up to 4 seconds.https://blogger.googleusercontent.com/tracker/6369594138980582994-7258685781956831836?l=sdoisgo.blogspot.com
More... (http://sdoisgo.blogspot.com/2011/02/todays-delta-h-maneuver.html)
At 1940 UT (2:40 pm ET) on February 9, 2011 SDO will execute a Delta-H maneuver. This is a planned activity. Science data will be interrupted for about 30 minutes. The actual duration will be determined by the onboard software as it changes the reaction wheel speeds and fires the thrusters of the spacecraft to complete the maneuver. The goal is to adjust the reaction wheel speeds so we can maintain the pointing of the spacecraft over the next few months.
Here is a picture of a test thruster being fired on the ground in 2006 (we cannot see the actual thrusters on the spacecraft.) The thrusters should fire for up to 4 seconds.https://blogger.googleusercontent.com/tracker/6369594138980582994-7258685781956831836?l=sdoisgo.blogspot.com
More... (http://sdoisgo.blogspot.com/2011/02/todays-delta-h-maneuver.html)