1998-06-13 (Flight #1766) |
Aircraft Flight SummaryDate: 1998-06-13 |
Flight Track Map
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1645-2245 UTC |
CAR - (QuickLook)
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Flight Mission Details
Conducted BRDF measurements over stratus cloud and sea ice in the vicinity of the SHEBA site. The CAR was stuck in position 3 (BRDF mode) for most of the flight.
Flight Path, Timing, and Measurements
Weather over Barrow at the beginning of the flight was 90% cloud cover (stratocumulus) and some cirrus. Started the CAR at scan 60 (17:05 UTC) and set the CAR to nadir scanning (position 1). Leaving the CAR in this mode some test were performed to assess the previous flights conclusions on the filter-wheel associated noise problem.
Although on the previous flight we had hesitantly concluded that the noise was repeatable, in that noise spikes would appear in all channels during a filter change when any channel was saturated. In this flight further tests (approx. scan 6022, 18:55 UTC) revealed that this may not be the case. Setting the gain to its minimum value and repeating the noise tests yielded further noise when the filter wheel was used. This implies that the noise may have another source. (after this the filter wheel was not used for this flight)
On arrival at the SHEBA site several cloud layers were evident. The edge of a shadow from an upper level cloud deck fell directly over the SHEBA site, so a planned BRDF measurement was made near, but not over, the SHEBA site. The BRDF measurement was performed over uniform stratus cloud and was always well clear of the shadow boundary over the ship.
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On completion of this measurement the CAR was stuck in BRDF mode (3). Despite frequent attempts to change position it remained in this position throughout the flight. At the end of flights over SHEBA another BRDF measurement was performed (time constraints allowed only five loops over Barrow). This measurement was made at low altitude over the SHEBA site. The sun was visible (barely) through the cloud at this point.
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