2.2.2 spase://VSPO/NumericalData/Papitashvili/IP/ISEE3-IMP8/PT3600S ISEE 3 - IMP 8 Impact Parameters 2012-05-15T00:00:00Z ISEE 3 - IMP 8 - Earth impact parameters (IP). IP is the minimal distance by which a plasma element seen at one body misses being seen by a second body. Cf. http://ftpbrowser.gsfc.nasa.gov/impact_des.html spase://SMWG/Person/Natalia.E.Papitashvili GeneralContact spase://VSPO/NumericalData/P_IMPPARAMS_HDR_II spase://SMWG/Repository/NASA/GSFC/SPDF Online Open FTPBrowser http://ftpbrowser.gsfc.nasa.gov/impact_ii.html hourly and daily values via ftp from NSSDC ftp://nssdcftp.gsfc.nasa.gov/miscellaneous/orbits/impact_parameters/imp_isee3/ Text Ephemeris 1978-08-16T00:00:00 1984-01-31T00:00:00 PT3600.00S Heliosphere.NearEarth