Document title: Format description for NDADS PIONEER P11_HVM_IP_1M_ASCII datatype Project: PIONEER NDADS Datatype: P11_HVM_IP_1M_ASCII Super-EID: DOCUMENT There may be other documents also identified by this super-EID. NDADS filename: FORMAT_HVM_IP_P11_1M.TXT TRF entry: b46626.txt in NSSDC's controlled digital document library, Feb. 1998. Document text follows: ---------------------- Document Filename: FORMAT_HVM_IP_P11_1M.TXT Version 10/19/95 JFC Project/Datatype/EID: PIONEER/P11_HVM_IP_1M_ASCII/FORMAT =============================================================================== PIONEER 11 INTERPLANETARY MAGNETIC FIELD DATA - 1 MINUTE AVERAGES ----------------------------------------------------------------- Data Set Coverage (yyyy-mm-dd): 1973-04-06 to 1976-12-31 Experiment: Pioneer 11 Helium Vector Magnetometer (HVM) Principal Investigator: Dr. Edward J. Smith, NASA JPL Data Set Contact: Joyce Wolf, NASA JPL Data Set Submission Date: 1995-07-24 NSSDC Data Set ID: 73-019A-01J NSSDC Acquisition Agent: Dr. J. F. Cooper, Hughes STX Corp., Greenbelt, MD Data Set Description: This data set from the Pioneer 11 Helium Vector Magnetometer (HVM) consists of one minute averages of vector components and scalar magnitudes of the interplanetary magnetic field. The three components (Br, Bt, Bn) are given in the RTN coordinate system and all magnetic fields are expressed in nanotelsa units. The scalar magnitudes (B) are averages of higher resolution scalar magnitudes. The time tag for each one-minute interval is the midpoint of the averaging interval in SCET-UT (Spacecraft Event Time - UT). The averages were originally calculated over one-minute intervals in Ground Received Time, and the midpoints have been converted to SCET-UT. A separate data file file contains daily values for the one-way light-time delay. No records are written for data gaps. The minute average files cover up to one month of data for consecutive months. Data for the Jupiter encounter, days 328-348 of 1974, and for the Saturn encounter, days 242-251 of 1979, are not included. The RTN system is fixed to the sun-spacecraft line and aligned with the solar heliographic equator. The R axis is the radial direction to the spacecraft, the T axis is the cross product of the solar rotation axis and the R axis, and N is the cross product of R and T. Document files for Project/Datatype/EID = PIONEER/P11_HVM_IP_1M_ASCII/FORMAT FORMAT_HVM_IP_P11_1M.TXT - this format document (ASCII) Data files for Project/Datatype/EID = PIONEER/P11_HVM_IP_1M_ASCII/yymm yymm_HVM_IP_P11_1M.ASC - minute average ASCII data files from Pioneer 11 HVM including data from year/month yy/mm Data files for Project/Datatype/EID = PIONEER/P11_LIGHTTIME_ASCII/yyddd_yyddd yyddd_yyddd_LIGHT_IP_P11.ASC - supplementary ASCII data file with one-way light-time delays Parameter Format for 1-min. data files: IY - SCET-UT Year (yy) IDOY - SCET-UT Day of Year (ddd) , IDOY = 1 for Jan. 1 IHR - SCET-UT Hour of day IMIN - SCET-UT Minute of hour ISEC - SCET-UT Second of minute BR - Radial component (RTN system) of vector magnetic field in nT BT - Transverse component (RTN) of vector magnetic field in nT BN - Normal component (RTN) of vector magnetic field in nT B - Scaler magnetic field magnitude in nT The data records are read in ASCII FORTRAN format as follows: READ(10,110) IY, IDOY, IHR, IMIN, ISEC, BR, BT, BN, B 110 FORMAT(1X,I2,I4.3,3I3.2, 4F8.4) Acknowledgement: Please acknowledge the National Space Science Data Center and the Principal Investigator, Dr. E. J. Smith of NASA's Jet Propulsion Laboratory, for use of this data in publications. Related Information: The file VOLDESC_HVM_IP_P11_15M (Project/Datatype/EID = PIONEER/P11_HVM_IP_15M /VOLDESC_SFD) provides a detailed description of the Pioneer spacecraft, the HVM experiment, and the 15-min. average data. This ASCII document is written in Standard Formatted Data Unit (SFDU) format as part of NSSDC data set 73-019A-01H for 15-minute averaged data covering 1973-04-06 to 1992-12-31. Other information about the Pioneer mission, experiments, and data sets at NSSDC may be obtained via World Wide Web and NSSDC's space physics page at http://nssdc.gsfc.nasa.gov/space/space_physics_home.html. Non-WWW users may access NSSDC information in the NASA Master Directory and the NSSDC Master catalog via Internet login to the NSSDC On-Line Data Information Service (NODIS) at nodis@nssdca.gsfc.nasa.gov. Pioneer data on NDADS (NASA's Data Archive and Distribution Service) may be located via WWW or an e-mail message to ARMS (Automated Retrieval Mail System) at archives@ndadsa.gsfc.nasa.gov with "HOLDINGS" on the subject line.