2.0.0 spase://VHO/NumericalData/Vega2/PLASMAG/PT20M Vega 2 solar wind parameters (20-min) 2009-05-20T19:08:29Z This data set is a 20-min-resolution collection of solar wind plasma parameters from the interplanetary phases of the Soviet Vega 2 mission to Comet Halley. The data consist of proton flow speeds, densities and temperatures determined by fitting counts-vs-energy data measured on the sunward-looking electrostatic analyzer to a convecting Maxwellian. There are actually two sets of parameters, one ("linear") obtained by minimizing the sum of squares of measured and modelled counts and the other ("log") used logs of counts rather than counts themselves. Also included are numbers of energy intervals used in the linear and log determinations less than and greater than the spectral peaks. The data are at 20-min resolution because the during cruise phase only one or two 10-sec spectra were determined every 20 minutes. Further, the data have long gaps between the first and last days of coverage. The major data gaps are +---------------------------------------------------------------+ | Vega 1: | Vega 2: | |----------------------------------------------------------------+ | 85/04/20 - 85/07/23 | 85/04/16 - 85/07/24 | | 85/12/21 - 86/01/05 | 85/09/27 - 85/11/27 | | 86/04/29 - 86/08/04 | 85/12/03 - 86/02/20 | | | 86/02/23 - 86/03/06 | +----------------------------------------------------------------+ Discussions of this investigation are found in Gringauz et al (Nature, v321, p282, 1986), Galeev et al (JGR, v93, p7527, 1988) and references therein. Dr. M. Verigin of the Space Research Institute in Moscow. spase://SMWG/Person/Mikhail.I.Verigin CoInvestigator DataProducer spase://SMWG/Person/Natalia.E.Papitashvili TechnicalContact spase://SMWG/Person/Jan.Merka MetadataContact spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF FTP area ftp://spdf.gsfc.nasa.gov/pub/data/zzz_old/vega_data_from_nssdc/plasma/ FTP access to Vega mission data at NSSDC. SPDF HTTP area http://spdf.gsfc.nasa.gov/pub/data/zzz_old/vega_data_from_nssdc/plasma/ In CDF via HTTP from SPDF Text.ASCII ASCII The National Space Science Data Center(NSSDC), Space Physics Data Facility(SPDF). spase://SMWG/Instrument/Vega2/PLASMAG ThermalPlasma 1985-03-09T04:46:26Z 1986-10-04T06:13:32Z PT20M Heliosphere.Inner Comet Year Column 1 Time of observation (year) Temporal Month Column 2 Time of observation (month of year) Temporal Day Column 3 Time of observation (day of month) Temporal Hour Column 4 Time of observation (hour of day) Temporal Minute Column 5 Time of observation (minute) Temporal Second Column 6 Time of observation (second) s Temporal ID Column 7 Spacecraft ID: * 1 = Vega 1 * 2 = Vega 2 1 2 Other Vp (lin) Column 8 Proton speed (km/s), linear fit. km/s 1e3>m/s 9999.90 Proton Fit Magnitude Velocity 1 50 25000 eV Vp (log) Column 9 Proton speed (km/s), log fit. km/s 1e3>m/s 9999.90 Proton Fit Magnitude Velocity 1 50 25000 eV Np (lin) Column 10 Proton density (cm^-3), linear fit cm^-3 1e-6>m^-3 999.990 Proton Fit NumberDensity 1 50 25000 eV Np (log) Column 11 Proton density (cm^-3), log fit cm^-3 1e-6>m^-3 999.990 Proton Fit NumberDensity 1 50 25000 eV Tp (lin) Column 12 Proton temperature (K), linear fit K 0.1E35 Proton Fit Temperature 1 50 25000 eV Tp (log) Column 13 Proton temperature (K), log fit K 0.1E35 Proton Fit Temperature 1 50 25000 eV Code Column 14 4-digit number abcd that codes the number of ion energy intervals used in lin (a+b+1) or log (c+d+1) maxwellian fitting procedures. * a,c - number of intervals used with energies less than energy of ion spectra maximum. * b,d - number of intervals used with energies more than energy of ion spectra maximum. Other