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Second Heliospheric CD-ROM and Accompanying Software


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1963-11-02 to 1996-12-01


NSSDC's first heliospheric CD-ROM, issued in 1994, contained data from near-Earth and deep-space spacecraft, mostly at 1-hour resolution with limited data at 5-min resolution. Data were primarily solar wind magnetic field and plasma data, in both ASCII and CDF formats. All relevent data are now network-accessible, so the demand for the CD-ROM has been limited. (Copies are still available by request to NSSDC.)

NSSDC has just issued a more limited follow-on to the original CD-ROM. The data contained are again near-Earth and deep-space magnetic field and plasma data, although this time only at hourly resolution and only in ASCII format. The new CD-ROM covers the full time span available for each data set contained, including about 35 spacecraft-years of data not contained on the first CD-ROM. The data sets contained, and time spans of each, are further described in the CD-ROM's README.DOC file.

The data on this second CD-ROM are also available at under the relevant spacecraft in directories labelled as "merged". The data may also be access from OMNIWeb at or from COHOWeb at

Owing to the anticipated low demand for this new CD-ROM, NSSDC chose not to have the CD-ROM commercially mastered and mass-replicated. Accordingly, this means we must charge users a little more to satisfy requests, but is does offer the option to create a CD-ROM on request with the latest available data on NSSDC's online files.

The MS-DOS-compatible software created at NSSDC to support use of the first CD-ROM has been upgraded slightly to support this second disk in MD-DOS or MD-DOS emulation. The software creates files subsetted by time and parameter, and offers options to list or graphically display parameter values or move files to magnetic disk for further analysis. This software is ANON/FTP-accessible from node, directory pub/cdrom/software/dos, file helios_n.exe.

Comments which may improve the usability of this data product, or any other NSSDC product, are most welcome.

Alternate Names

  • Second Heliospheric CD


  • Space Physics: Heliospheric Studies


  • SM-41G

Additional Information


Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Joseph H. KingData ProviderNASA Goddard Space Flight
Dr. Joseph H. KingGeneral ContactNASA Goddard Space Flight
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