HELIOS-2 ZIP archived data CDROM Data from entire mission ============================================================================== Introduction ============================================================================== This CDROM contains Average, Peak, Vdiff and Sn data for the HELIOS-2 from 1976/01/18 to 1980/03/08. All users are encouraged to verify the "correctness" of the data prior to submitting any publications or other work based on these data. ============================================================================== Disk Format ============================================================================== The disk is formatted according to both ISO 9660 and POSIX (Unix) standards in order to accommodate users on a wide variety of platforms. All of the data files are ascii files. The directory hierarchy on this CD-ROM is composed of three major sub- directories with minor subdirectories as required. The major subdirectories and root files are given below: README.TXT This document describes the structure of the CDROM and file formats. INDEX This directory contains a cumulative index file index.txt which describes the location of all files on the disk. DATA This directory contains 4 sub-directories named average, peak, vdiff and sn for corresponding data. The data in these sub- directories are organized in to ZIP compressed archives according to the year and the month of the data. Each ZIP file contains all available data for a 3-month interval and is named ayymm-mm for Helios-1 and byymm-mm for Helios-2. where yy is year of the century and mm-mm is one of the following: 01-03 for January through March 04-06 for April through June 07-09 for July through September 10-12 for October through December DOC This directory contains the documentory files for Helios 1 and 2. intro.txt - Introduction to HELIOS E5A Plasma Wave Experiment. helios1.txt and helios2.txt - Helios Final Report. helios_a.cal - Helios-1 calibrated voltages. helios_b.cal - Helios-2 calibrated voltages. orbits.jpg - Orbits diagram for helios 1 and 2. ============================================================================== File Format ============================================================================== All files in this disk are ASCII files. The format of the data files in each data subdirectories is as follows: ./data/average: This directory contains Helios-A average data files. Each data file named according to the starting GMT time of the data. avyymmdd.dat av to denote the Helios average data files. yy is last two digit of the year. mm is the month of the year. dd is the day of the month. Format description of Helios average files Each record contains Start time of the data, Sector Number (see Helios documentation) and 16 average values correspond to 16 channels. The time string is of the form 19yy-mm-ddThh:min:secZ where hh is hour of the day. min is the minute of the hour. sec is the seconds of the day. Sector Number and 16 average values have written as in the Fortran FORMAT(1x,I2,16I3) Here average values represent uncalibrated byte numbers of average data. ----------------------------------------------------------------------------- ./data/peak: This directory contains Helios peak data files. Each data file named according to the starting GMT time of the data. pkyymmdd.dat pk to denote the Helios peak data files. Format description of Helios peak files Each record contains Start time of the data, Sector Number (see Helios documentation) and 16 peak values correspond to 16 channels. The time string is of the form 19yy-mm-ddThh:min:secZ Sector Number and 16 peak values have written as in the Fortran FORMAT(1x,I2,16I3) Here peak values represent uncalibrated byte numbers of peak data. ----------------------------------------------------------------------------- ./data/vdiff: This directory contains Helios vdiff data files. Each data file named according to the starting GMT time of the data. vdyymmdd.dat vd to denote the Helios vdiff data files. Format description of Helios vdiff files Each record contains Start time of the data, Sector Number (see Helios documentation) and 8 vdiff values. The time string is of the form 19yy-mm-ddThh:min:secZ Sector Number and 8 vdiff values have written as in the Fortran FORMAT(1x,I2,8I4) Here vdiff values represent uncalibrated byte numbers of vdiff data. ------------------------------------------------------------------------------ ./data/sn: This directory contains Helios sn data files. Each data file named according to the starting GMT time of the data. snyymmdd.dat sn to denote the Helios sn data files. Format description of Helios sn files Each record contains Start time of the data, Sector Number (see Helios documentation) and 8 sn values. The time string is of the form 19yy-mm-ddThh:min:secZ Sector Number and 8 sn values have written as in the Fortran FORMAT(1x,I2,8I4) Here sn values represent uncalibrated byte numbers of sn data. For more details about the Helios 1 and 2 E5A data description, please refer to the GSFC publication (X-565-76-69) titled "Data Processing Report for HELIOS-1 and 2" dated December 1976. ============================================================================== Driver and Hardware Information ============================================================================== This disk has been formatted according to the ISO standard for CDROM production (9660) with level 1 compliance. Any system which complies with this standard (all of them should) should be able to access this disk. ============================================================================== Point of Contact ============================================================================== Dr. Roger R. Anderson Dept. of Physics & Astronomy The University of Iowa Iowa City, IA 52242 (319)335-1924 roger-r-anderson@uiowa.edu ============================================================================== Cognizant Persons ============================================================================== The person most directly responsible for the construction of this CDROM is Dr. Gamini Munasinghe. Current technical contact is Larry Granroth, e-mail larry-granroth@uiowa.edu