Document title: Format description for NDADS PIONEER P11_HVM_IP_1H_ASCII datatype Project: PIONEER NDADS Datatype: P11_HVM_IP_1H_ASCII Super-EID: DOCUMENT There may be other documents also identified by this super-EID. NDADS filename: FORMAT_HVM_IP_P11_1H.TXT TRF entry: b46630.txt in NSSDC's controlled digital document library, Feb. 1998. Document text follows: ---------------------- Document Filename: FORMAT_HVM_IP_P11_1H.TXT Version 10/19/95 JFC Project/Datatype/EID: PIONEER/P11_HVM_IP_1H_ASCII/FORMAT =============================================================================== PIONEER 11 INTERPLANETARY MAGNETIC FIELD DATA - 1 HOUR AVERAGES ----------------------------------------------------------------- Data Set Coverage (yyyy-mm-dd): 1973-04-06 to 1992-08-01 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: 1993-09-16 NSSDC Data Set ID: 73-019A-01I NSSDC Acquisition Agent: Dr. J. F. Cooper, Hughes STX Corp., Greenbelt, MD Data Set Description: The Helium Vector Magnetometer (HVM) measurements of interplanetary magnetic fields are averaged at one-hour intervals with respect to Spacecraft Event Time - UT. Data set parameters include the three orthogonal components of the magnetic field in RTN coordinates, where R is in the sun-s/c direction, T is the cross product of the solar rotation axis and R, and N is the cross product of R and T. The hourly field magnitude, averaged over scalar magnitudes at higher time resolution, is also provided. All field values are in nanotelsa. The data files include up to one year of ASCII data for each consecutive year. Document files for Project/Datatype/EID = PIONEER/P11_HVM_IP_1H_ASCII/FORMAT FORMAT_HVM_IP_P11_1H.TXT - this format document (ASCII) Data files for Project/Datatype/EID = PIONEER/P11_HVM_IP_1H_ASCII/yyddd_yyddd yyddd_yyddd_HVM_IP_P11_1H.ASC - Hour average ASCII data files for year/day start & end dates yyddd_yyddd with these dates on, or within, six month boundaries (e.g., Jan.1 - June 30). Parameter format for data file: IY - SCET-UT Year (yy) IDOY - SCET-UT Day of Year (ddd) , IDOY = 1 for Jan. 1 IHR - SCET-UT Hour of day 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 RAU - Radial distance from Sun to spacecraft in AU ELAT - Ecliptic latitude of spacecraft in degrees ELON - Ecliptic longitude of spacecraft in degrees The following FORTRAN read statement will read the hourly data records: READ(10,10) IY, IDOY, IHR, BR, BT, BN, B, RAU, ELAT, ELON 10 FORMAT(I3, I4, I3, 4F9.4, F9.5, F7.1, F8.1) 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.TXT (Project/Datatype/EID = P11_HVM_IP_15M_ ASCII/VOLDESC_SFD) provides a detailed description of the Pioneer spacecraft, the HVM experiment, and the 15-minute average data set. 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 the same time interval. Unlike the 1-hour data set here, the 15-min. data set gives times as Ground Received Time - UT and the coordinate system switches to Pioneer Ecliptic in 1976 and thereafter. 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.