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Advanced Composition Explorer Level 2 SWICS/SWIMS 1-Hour Solar Wind, HDF


Availability: Archived at NSSDC, accessible from elsewhere

Time span: 1998-01-23 to 2001-01-06


This data collection contains hourly Level 2 data in binary Hierarchical Data Format (HDF) format from the Solar Wind Ion Composition Spectrometer (SWICS) and Solar Wind Ion Mass Spectrometer (SWIMS) experiments on the Advanced Composition Explorer (ACE) spacecraft. Each data record contains bulk and thermal speeds (km/s) for selected ions (1H+1, He+2, O+6, Mg+10, and Fe+11), abundance ratios of selected elements (4He+2/O, 20Ne+8/O, 24Mg+10/O, and 56Fe+(7 to 12)/O), ratios of charge states for the same elements (C+5/C+6, O+7/O+6, and Fe+11/Fe+9), and ratios of isotopes for the same elements (3He+2/4He+2, 22Ne+8/20Ne+8, and 26Mg+10/24Mg+10). A data value of -999.9 indicates bad or missing data for the given time period. The data files include one file covering the entire data set and individual files for each 27-day Bartels interval. Release notes on Level 2 processing are given in the text file swics_swims_release_notes.txt. The SWIMS and SWICS versions of this data set are identical.

This collection is available on-line at:

Alternate Names

  • SWICS/SWIMS L2 1-Hour Plasma,HDF


  • Space Physics: Heliospheric Studies


  • 97-045A-01A
  • 97-045A-02A

Additional Information



Questions and comments about this data collection can be directed to: Dr. John F. Cooper



NameRoleOriginal AffiliationE-mail
Dr. Andrew J. DavisGeneral ContactCalifornia Institute of
Mr. Robert M. CandeyGeneral ContactNASA Goddard Space Flight
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