​The table below and data continuity documents describe significant changes in the Vaisala Radiosonde RS92 family and the related ground equipment.

In all the cases, the effect on measurement outcome is small compared to the total uncertainty in sounding. The referred performance specification can be found from the enclosed Vaisala Radiosonde RS92-SGP brochure. Also significant changes that do not, in our opinion, have any effect on time series have been listed; those are marked with "No data continuity effect".

To be able to use the data continuity documents the following information about the sounding system has to be known:

• Types and serial numbers of the radiosondes used within the studied timeframe
• Ground equipment software versions used within the studied timeframe

Identification data can be found from the following documents:

Changes that can be identified with the help of the radiosonde serial number

​Time	​Model	​Description	​Parameter	​No data continuity effect
Apr 2004​	RS92​	Fine tuned humidity sensor temperature dependency correction​	U​	​
​Mar 2005	​RS92-SGP	​Pulse heating of humidity sensors continued down to  -60°C	​U	​
​Sep 2006	​RS92	Improved coating of humidity sensor contacts​	​U	​
​Mar 2007	​RS92	​Reinforced temperature sensor	​T	​
​Jun 2008	​RS92	​Sensor boom coating modification	​U, T	​X

 
Changes that can be identified with the help of the DigiCORA® sounding software version and/or a user setting

​Time	​Description	Parameter	​No data continuity effect
​Nov 2005	​Revised solar radiation correction table for temperature sensor	​T	​
​Jun 2006	​Extending reported TEMP humidity measurements to -100°C	​U	​X
​Aug 2008	​Filtering algorithm modified in order to take into account requirements for temperature measurement above 10 hPa in ozone soundings and soundings in heavy test flight rig	​T	​