For particle data look at:
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/russian_msu/vega-1/
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/russian_msu/vega-2/
additional data description at:
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/russian_msu/