Below are current conservative estimates of exposure times for the UV channels based on a HRTS spectrum covering active regions and quiet Sun.
Estimated exposure rates (electrons/pixel/second).
| Filter name | 1216A | 1550A | 1600A | 1700A | WL |
|---|---|---|---|---|---|
| Filter pos. | 13 | 21 | 16 | 18 | 15 |
| Active region | 45 | 7 | 100 | 20 | 22000 |
| Active region at limb | 100 | 20 | 270 | 40 | 22000 |
| Quiet region | 30 | 4 | 80 | 20 | 22000 |
| Quiet region at limb | 30 | 7 | 90 | 20 | 22000 |
Sample exposures in seconds (for 1/2 well or 2048DN)
| Filter name | 1216A | 1550A | 1600A | 1700A | WL |
|---|---|---|---|---|---|
| Filter pos. | 13 | 21 | 16 | 18 | 15 |
| Active region | 45 | 290 | 20 | 100 | 0.093 |
| Active region at limb | 20 | 100 | 8 | 50 | 0.093 |
| Quiet region | 70 | 500 | 25 | 100 | 0.093 |
| Quiet region at limb | 70 | 300 | 25 | 100 | 0.093 |
Sample exposures in seconds (for 1/10 well of 410DN)
| Filter name | 1216A | 1550A | 1600A | 1700A | WL |
|---|---|---|---|---|---|
| Filter pos. | 13 | 21 | 16 | 18 | >15 |
| Active region | 9 | 60 | 4 | 20 | 0.019 |
| Active region at limb | 4 | 20 | 1.5 | 10 | 0.019 |
| Quiet region | 14 | 100 | 5 | 20 | 0.019 |
| Quiet region at limb | 14 | 60 | 5 | 20 | 0.019 |
Note: The estimates for Lyman alpha are as yet very uncertain.
Estimates by Brian Handy, 24 April 1997.