PVO Ion Mass Spectrometer high-resolution data are stored in single-orbit ASCII files. All of the data files have the same internal structure, which is described by the single format file OIMSDATA.FMT. File structure characteristics which may vary from file to file (# of records, start/stop time, etc.) are described in the individual PDS label files (*.LBL). Columns in all data files: ======================================================= name type description ------------------------------------------------------- PVO TIME char Date and time in format YYDOY FSEC, where YY is the year, DOY is the day-of-year & FSEC is the decimal second-of-day DWELL int Dwell time (time interval between samples, msec) DWELL = (TIME - UT)*1000/(n-1) BITS int Telemetry bit rate LAT float Venusian Latitude LON float Venusian Longitude ALT float Altitude SZA float Solar Zenith Angle SHA float Solar Hour Angle
MASS1 int Mass of Sample 1 DEN1 float Number density of Sample 1 MASS2 int Mass of Sample 2 DEN2 float Number density of Sample 2 . . . . . . . . . MASS55 int Mass of Sample 55 DEN55 float Number density of Sample 55 The values 999 and 9.9999e+04 are the missing data values for mass and density respectively. The value 99999.999 is the missing data value for the second-of-day part of the time column. Negative values in a density column indicate flagged (unreliable) data values. Data Files (.TAB extension) The high-resolution data files on this disk are ASCII table files, each having 118 columns and record length 953 bytes. Information about the individual files (number of records, start and stop times, etc.) can be obtained from the PDS label file accompanying each *.TAB file. This label file has the same filename as the data file but with .TAB replaced by .LBL. List of data files: ============================================================================ Name Records Cols Len Start Stop ---------------------------------------------------------------------------- ORB1905 372 118 953 1984-02-22T23:59:46.047Z 1984-02-23T00:59:36.472Z ORB1911 381 118 953 1984-02-28T23:58:20.867Z 1984-02-29T00:58:11.591Z ORB1912 564 118 953 1984-02-29T23:58:06.344Z 1984-03-01T00:57:57.400Z ORB1913 259 118 953 1984-03-01T23:57:49.172Z 1984-03-02T00:57:28.966Z ORB1914 371 118 953 1984-03-02T23:57:34.945Z 1984-03-03T00:57:26.597Z ORB1915 117 118 953 1984-03-03T23:57:16.742Z 1984-03-04T00:56:42.219Z ORB1916 371 118 953 1984-03-04T23:57:02.312Z 1984-03-05T00:56:53.147Z ORB1917 118 118 953 1984-03-05T23:56:46.852Z 1984-03-06T00:56:18.367Z ORB1918 369 118 953 1984-03-06T23:56:22.711Z 1984-03-07T00:56:14.190Z ORB1919 251 118 953 1984-03-07T23:56:14.969Z 1984-03-08T00:55:59.941Z ORB1920 557 118 953 1984-03-08T23:55:49.742Z 1984-03-09T00:55:41.048Z ORB1922 249 118 953 1984-03-10T23:55:20.578Z 1984-03-11T00:54:49.874Z ORB1923 351 118 953 1984-03-11T23:54:53.883Z 1984-03-12T00:54:44.460Z ORB1924 571 118 953 1984-03-12T23:54:34.008Z 1984-03-13T00:54:25.034Z ORB1926 122 118 953 1984-03-14T23:53:59.852Z 1984-03-15T00:53:44.821Z ORB1927 224 118 953 1984-03-15T23:53:48.422Z 1984-03-16T00:53:31.945Z ORB1928 354 118 953 1984-03-16T23:53:20.469Z 1984-03-17T00:53:08.239Z ORB1929 232 118 953 1984-03-17T23:53:18.766Z 1984-03-18T00:52:31.034Z ORB1930 331 118 953 1984-03-18T23:52:41.562Z 1984-03-19T00:52:28.583Z ORB1931 222 118 953 1984-03-19T23:52:43.109Z 1984-03-20T00:51:56.884Z ORB1932 340 118 953 1984-03-20T23:52:10.672Z 1984-03-21T00:51:58.194Z ORB1933 223 118 953 1984-03-21T23:52:04.734Z 1984-03-22T00:51:18.254Z ORB1934 572 118 953 1984-03-22T23:51:26.219Z 1984-03-23T00:51:23.620Z ORB1935 571 118 953 1984-03-23T23:51:13.102Z 1984-03-24T00:51:04.183Z ORB1936 571 118 953 1984-03-24T23:50:53.258Z 1984-03-25T00:50:44.453Z ORB1937 334 118 953 1984-03-25T23:50:41.086Z 1984-03-26T00:50:28.511Z ORB1938 234 118 953 1984-03-26T23:50:27.047Z 1984-03-27T00:50:14.569Z ORB1939 571 118 953 1984-03-27T23:49:59.617Z 1984-03-28T00:49:56.640Z ORB1940 220 118 953 1984-03-28T23:50:01.688Z 1984-03-29T00:49:42.715Z ORB1941 232 118 953 1984-03-29T23:49:45.273Z 1984-03-30T00:49:24.296Z ORB1942 354 118 953 1984-03-30T23:49:20.844Z 1984-03-31T00:49:08.367Z ORB1943 235 118 953 1984-03-31T23:49:08.914Z 1984-04-01T00:48:52.440Z ORB1944 356 118 953 1984-04-01T23:48:47.000Z 1984-04-02T00:48:34.024Z ORB1945 234 118 953 1984-04-02T23:48:44.578Z 1984-04-03T00:48:25.603Z ORB1946 313 118 953 1984-04-03T23:48:26.766Z 1984-04-04T00:48:08.439Z ORB1947 233 118 953 1984-04-04T23:48:21.000Z 1984-04-05T00:48:02.026Z ORB1948 234 118 953 1984-04-05T23:48:02.578Z 1984-04-06T00:47:51.600Z ORB1949 350 118 953 1984-04-06T23:47:50.156Z 1984-04-07T00:47:30.432Z ORB1950 232 118 953 1984-04-07T23:47:34.992Z 1984-04-08T00:47:29.267Z ORB1951 350 118 953 1984-04-08T23:47:28.430Z 1984-04-09T00:47:16.102Z ORB1953 357 118 953 1984-04-10T23:47:00.859Z 1984-04-11T00:46:55.279Z ORB1954 246 118 953 1984-04-11T23:50:46.094Z 1984-04-12T00:46:50.365Z ORB1955 221 118 953 1984-04-12T23:46:56.930Z 1984-04-13T00:46:39.204Z ORB1956 302 118 953 1984-04-13T23:46:43.766Z 1984-04-14T00:46:33.572Z ORB1957 171 118 953 1984-04-14T23:47:53.336Z 1984-04-15T00:46:05.612Z ORB1958 330 118 953 1984-04-15T23:46:24.172Z 1984-04-16T00:42:28.195Z ORB1960 325 118 953 1984-04-17T23:46:19.078Z 1984-04-18T00:46:00.102Z ORB1961 178 118 953 1984-04-18T23:46:26.641Z 1984-04-19T00:46:03.670Z ORB1962 222 118 953 1984-04-19T23:46:20.227Z 1984-04-20T00:45:37.754Z ORB1963 346 118 953 1984-04-20T23:46:08.312Z 1984-04-21T00:45:55.837Z ORB1964 233 118 953 1984-04-21T23:44:36.391Z 1984-04-22T00:44:14.670Z ORB1965 356 118 953 1984-04-22T23:44:21.828Z 1984-04-23T00:44:10.252Z ORB1966 188 118 953 1984-04-23T23:44:06.812Z 1984-04-24T00:24:23.518Z ORB1967 245 118 953 1984-04-24T23:43:52.891Z 1984-04-25T00:30:39.159Z ORB1968 174 118 953 1984-04-25T23:44:01.711Z 1984-04-26T00:32:33.730Z ORB1969 214 118 953 1984-04-26T23:43:34.289Z 1984-04-27T00:43:07.313Z ORB1970 401 118 953 1984-04-27T23:43:13.867Z 1984-04-28T00:34:44.491Z ORB1971 175 118 953 1984-04-28T23:43:22.445Z 1984-04-29T00:42:39.471Z ORB1972 466 118 953 1984-04-29T23:42:58.023Z 1984-04-30T00:42:44.048Z ORB1973 217 118 953 1984-04-30T23:43:24.594Z 1984-05-01T00:42:32.618Z ORB1974 463 118 953 1984-05-01T23:42:33.172Z 1984-05-02T00:42:24.193Z ORB1975 207 118 953 1984-05-02T23:42:36.742Z 1984-05-03T00:42:09.766Z ORB1976 211 118 953 1984-05-03T23:42:18.312Z 1984-05-04T00:41:59.339Z ORB1977 505 118 953 1984-05-04T23:41:56.883Z 1984-05-05T00:40:30.994Z ORB1978 174 118 953 1984-05-05T23:42:08.445Z 1984-05-06T00:41:21.468Z ORB1979 425 118 953 1984-05-06T23:41:48.609Z 1984-05-07T00:41:33.033Z ORB1981 311 118 953 1984-00-00T23:41:29.188Z 1984-01-01T00:41:07.399Z ORB1982 120 118 953 1984-05-09T23:41:24.578Z 1984-05-10T00:41:02.602Z ORB1983 140 118 953 1984-05-10T23:41:16.227Z 1984-05-11T00:40:54.249Z ORB1984 362 118 953 1984-05-11T23:40:59.742Z 1984-05-12T00:40:00.361Z ORB1985 133 118 953 1984-05-12T23:41:01.422Z 1984-05-13T00:40:39.447Z ORB1986 409 118 953 1984-05-13T23:40:38.555Z 1984-05-14T00:40:28.978Z ORB1987 213 118 953 1984-05-14T23:40:43.500Z 1984-05-15T00:40:11.526Z ORB1988 415 118 953 1984-05-15T23:40:14.047Z 1984-05-16T00:39:57.071Z ORB1989 208 118 953 1984-05-16T23:40:23.594Z 1984-05-17T00:39:52.617Z ORB1990 176 118 953 1984-05-17T23:40:15.141Z 1984-05-18T00:39:31.169Z ORB1991 444 118 953 1984-05-18T23:39:52.297Z 1984-05-19T00:39:32.722Z ORB1993 440 118 953 1984-05-20T23:39:21.430Z 1984-05-21T00:35:33.849Z ORB1994 173 118 953 1984-05-21T23:39:10.391Z 1984-05-22T00:38:50.414Z ORB1995 493 118 953 1984-05-22T23:39:05.555Z 1984-05-23T00:36:31.662Z ORB1996 201 118 953 1984-05-23T23:39:05.516Z 1984-05-24T00:38:37.541Z ORB1997 171 118 953 1984-05-24T23:39:04.062Z 1984-05-25T00:38:10.090Z ORB1998 432 118 953 1984-05-25T23:38:16.625Z 1984-05-26T00:38:10.653Z ORB1999 171 118 953 1984-05-26T23:38:45.188Z 1984-05-27T00:37:45.215Z Catalog Files (.CAT extension) Catalog data, which includes instrument, dataset, mission and spacecraft descriptions, can be found in the *.CAT files in the CATALOG directory on this disk.