Date: March 29, 1999
Mission: NOAA-15 underflight. IPO Bkn low clouds, CO retrieval. ER-2 instrument calibration.
Underfly NOAA-15 in clear sky conditions over Lake Michigan for calibration comparisons between ER-2 and NOAA-15 instruments (AERIbago at L. Michigan lakeshore). Test NAST-I atmospheric retrievals in broken low cloud conditions with radiosonde network aloft. Test MODIS cloud detection in low light conditions. Overfly MKE for DNR CO monitoring measurements. Compare ER-2 based instrument calibration over L. Michigan. Overfly SSEC for HSRL, AERI comparisons to ER-2 instruments.
Take-off was at 2300 UTC. ER-2 landed at 0245 UTC (99089).
ER-2 spiraled up from Truax and flew south towards N. Indiana (40n, 86:52w) to overfly boundary layer cu which formed in daytime solar heating. Cu was rapidly dissipating before ER-2 arrived so only sct to few cu remaining when ER-2 overflew. Then flew from N. Indiana to SE corner of L. Michigan racetrack. Eastern line (42:08n 86:50w to 43:44n 87:25w) of racetrack went over buoy 87007 and western leg was about 36km (19nm) west and parallel. Skies all clear during 3 orbits of racetrack. ER-2 met NOAA-15 (6:52pm CST; 0052 UTC) on 2nd orbit at end of eastern leg. AERIbago making measurements during entire time at its position on high cliff in Sheboygan overlooking L. Michigan. Classonde launched at 6:15pm from AERIbago site. After 3rd orbit, ER-2 flew in clear skies from central L. Michigan over MKE and on past MSN in darkness. HSRL operating, AERIbago operating, AERI on roof.
Clear skies over L. Michigan with NOAA-15 overhead. SCT low cu in low light conditions near synoptic radiosonde time. Clear scenes over MKE CO measurements at night.