1. Wind Retrieval at Millimeter and Submillimeter Wavelengths
Mike Janssen
26 June, 2001

2. Wind velocity vertical resolution @ 50 km
Submillimeter Lines
The spectral line due to 13CO as seen along a single
line of sight (i.e., pencil beam) tangent to 50-km altitude
The altitude weighting function for a frequency offset 1.5 MHz from the
line center in the previous plot. This is approximately the point of steepest
brightness gradient with frequency and is the point with the most sensitivity
to a wind-caused Doppler shift.

3. Wind velocity vertical resolution @ 100 km
Submillimeter Lines

4. Difference between 50-km 13CO line at rest and
Doppler-shifted by a 10-meter wind in the line of sight.
Submillimeter 13CO Line
Note: DT/MHz ~ 1.5 K
For Dt - 10 s
Ts = 2500 K
Note that the 10-sec measurement uncertainty of a 2500 K dsb noise
temperature receiver in a 1-MHz bandwidth is ~ 1.5 K, so we can expect
this velocity to be readily measureable.

5. 10-sec integration/point
Wind Retrieval, Submillimeter CO
Trec = 2500K
10-sec integration/point
12CO
Altitude, km
13CO
Retrieval Error, m/s

6. 10-sec integration/point
Wind Retrieval, Millimeter CO
Trec = 1000K
10-sec integration/point
12CO
Altitude, km
13CO
Retrieval Error, m/s