University of Washington, Dept of Atmospheric Sciences
High resolution Atmospheric Pressure
J. E. Tillman and Neal C. Johnson



These instruments are located at the Department of Atmospheric Sciences, University of Washington, Seattle Washington. They are approximately 33.5 meters (110 feet) above mean sea level. In typical atmospheric conditions this sensor reads approximately 4 millibars lower than it would at MSL.

The sensor plotted in red, called the primary sensor below, has been running continuously since 1993 with the factory calibration. The newer sensor in blue has been running with the factory calibration since 2000.

The primary sensor, developed by Vaisala Oy, Helsinki, Finland, is identical to that used for the Russian Mars 96 Program; their program includes European & US collaboration. We gratefully acknowledge Risto Pellinen and Ari-Matti Harri, Finnish Space Science Institute, for providing the sensor and Pekka Jarvi of Vaisala Oy, Helsinki, Finland , for integrating it into a commercial instrument and calibrating it for us.

Support was provided by NASA Headquarters ( Planetary Instruments Program ) and Jet Propulsion Laboratory. James E. Tillman, Neal C. Johnson and Fred Weller, UW, developed and maintain the system and software.

Further details about these pressure plots