Summary of 120kbps blocks (begins 2012/11/04 on Behind):

(2012/04/30)

Table showing relative Icer compression factors is here.

MB/day ID Cadence (minutes) & Compr w/SSR 2
450 120kbps/12 = 160kbps/16 below = 160kbps/16 below
388 120kbps/14 = 160kbps/18 below = 160kbps/18 below
282 120kbps/19 = 160kbps/24 below = 160kbps/24 below
241 120kbps/23 = 160kbps/30 below  
201 120kbps/27
  EUVI 195 5->10  
  COR 1 SEQ 20->60  
126 120kbps/30 (emergency use only)
  EUVI 195 (Icer7)  
  COR 1 SEQ 120  
  COR 1 IMG 10  
  COR 2 SEQ None  
  COR 2 IMG 30  
  HI 1 120  

Summary of 160kbps blocks:

(2011/06/27)

(change from 240kbps/22 below)

  Cadence (minutes) & Compr w/SSR 2
160kbps/16 = 240kbps/22 below
160kbps/18
COR 2 SEQ 2048->1024 (Icer6)  
COR 2 IMG 2048->1024 (Icer6)  
160kbps/24
EUVI 304 120  
EUVI 195 (Icer6)  
COR 1 SEQ 10  
COR 1 IMG (interleaved) 10  
160kbps/30
HI 1 60  
COR 1 SEQ 20  
COR 1 IMG 5(3/4)  
COR 2 SEQ 120  
COR 2 IMG 15(7/8)  

Summary of 240kbps Blocks in Use:

(2010/07/26)

  Cadence (minutes) & Compr w/SSR 2
240kbps/18 (=360kbps/22)
EUVI 195 2.5 (Icer5)  
EUVI 304 10 (Icer5) 2.5 (Icer5)
EUVI 284 120 (Icer6) 5 (Icer6)
EUVI 171 120 (Icer4) 1.25(Icer6)
COR 2 IMG 15(3/4) (Icer3)  
COR 2 SEQ 60 (Icer3)  
COR 1 SEQ 5 (Icer7) 2.5(Icer7)
HI 1 40  
HI 2 120  
Change from previous:
240kbps/22 (=360kbps/30)
EUVI 195 5  
240kbps/30
EUVI 195 (Icer6)  
EUVI 304 120  
240kbps/51 (=240kbps/30/120/reduced)
EUVI 195 10  
COR 2 IMG 30  
COR 2 SEQ None  
COR 1 SEQ 20  
HI 1 60  
Not in use:
240kbps/25 (=360kbps/36)
COR 1 SEQ 10  
240kbps/31
EUVI 195 10 (Icer5)  
EUVI 304   2.5(3/4)

Schedule Predicts

Beginning in May 2010 there was a lot of contention with other missions for STEREO-Behind. Here is a plot of actual and predicted daily scheduled volume as of 6/7/10:

plot of actual and predicted daily scheduled volume as of 6/7/10
(Horizontal red and blue lines are averages for the period; the other horizontal lines indicate volume if that block is used for the whole day.)

360kbps -> 240kbps

Behind changed to 240kbps on 2009/12/07. Ahead changes in April 2010. Here is a PDF file which has two tables: summary of SECCHI playback at various rates through 96kbps, and affect on SSR-2 pb if SSR-1 pb decreased; and summary of telemetry reduction options discussed on 2009/11/23.

480kbps -> 360kbps

Beginning on 2009/08/17, the SECCHI program on both spacecraft started using new schedules optimized for the 360kbps downlink mission phase. The primary difference between the 480kbps schedule is that the EUVI program is now dominant in 195A instead of 171A. Below is a summary of Differences between the new 360kbps/22hr schedule and old 480kbps/22hr schedule. Also noted are the differences between the 22hr, 30hr, and 36hr blocks. These are for SSR 1 images only.

 

HI

  • No change; same in 30hr, 36hr blocks

COR 2

  • 360kbps (schedule times)
  Polarized sequence	1 per hour	(00:08:15 01:08:15)
  Doubles		3 per hour	(00:24:00 00:39:00 00:54:00)
  Event Detect		2 per hour	(00:24-00:08, 00:54-00:39)
  • 480kbps (schedule times)
  Polarized sequence	2 per hour	(00:22:00 00:52:00)
  Doubles		2 per hour	(00:07:30 00:37:30)
  • Same in 30hr,36hr blocks

COR 1

  • No change; Same in 30hr.
  • In 36hr: cadence decreases from 5 to 10 min.

EUVI

  • EUVI 195A: 2.5 minute cadence from a 10 minute cadence
  • EUVI 171A: 120 minute cadence from a 2.5 minute cadence
  • EUVI 304A: No change
  • EUVI 284A: 120 minute cadence from a 20 minute cadence
     
  • In 30hr&36hr: decrease 195A cadence from 2.5 to 5 min.

More details on 22hr and 36hr blocks for SSR1-only, SSR1+SSR2, and EUVI Calibration

SECCHI-publication-number-goes-here