San Marco EFI AC/DC Data 

NSSDC-ID: 88-026A-05A

This San Marco D/L Electric Field Experiment (EFI) data set was provided 
by the PI team on 12 magnetic tapes in ASCII format and constitutes the 
final EFI archiving product (filename: yymmddhhmm.dc). The data from the
first tape are available online in this directory. The following parameters 
have been archived: (A) DC electric field (8 points per second) along 
the X and Y axes in spacecraft coordinates; (B) Variational (AC) electric 
fields averaged at 0.5 second intervals for all channels of each of the 
three spectrometers; (C) Some orbital parameters such as the altitude of 
the satellite, the geographic longitude and latitude, the local solar 
time and the dip latitude, and a day/night flag for the DC data; (D) Non-
reduced plasma ion densities measured by the Ion Velocity Instrument 
(IVI). The DC portion of the EFI experiment is only valid for non-reduced 
IVI data > 2.5 volts corresponding roughly to an electron density of 10^4 
electrons per cubic centimeter. Note that the AC data is valid at all 
plasma densities. More details can be found in the acformat_sfdu.txt and the 
voldesc_sfdu.txt files. Both of these 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/> (Rome University, 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, February 12, 2001