San Marco Ion Velocity Instrument (IVI) Data 

NSSDC-ID: 88-026A-03A

This data set includes the data from the Retarding Potential Analyzer and 
Ion Drift Meter instruments that constituted the San Marco Ion Velocitiy 
Investigation (IVI). The data were submitted by the PI team in ASCII
format with SFDU Voldesc and Format description files. The data are 
provided as monthly files. Each data record contains the following 
parameters deduced from the IVI measurements: ion temperature, spacecraft 
potential, vertical and horizontal component of the ion velocity, total 
ion density, H+ ion density, O+ ion density, and the density of molecular 
ions. In addition the following parameters are included with each record: 
date, time, dip latitude, altitude, geographic longitude and latitude, 
solar local time, and solar zenith angle. The time resolution is 
approximately 10 seconds. The data have been screened for errors due to 
lack of appropriate vehicle orientation information or to failure of the 
least-squares analysis routine. More information about the satellite
mission, the IVI experiment and the format of the data can be found in
the voldesc and format files. Both files are ASCII text files.

Further details about the San Marco spacecraft, experiment, and data sets 
can be found at the San Marco home pages 
<http://nssdc.gsfc.nasa.gov/space/space_phys/san.html> (NSSDC)
<http://crpsm.psm.uniroma1.it/> (Italy)

Acknowledgement:

Use of these data in publications should be accompanied at minimum by
acknowledgements of the National Space Science Data Center and the
responsible Principal Investigator.

dieter.bilitza@gsfc.nasa.gov, Feb 12, 2001