2.7.2 https://spdx.org/licenses/ SPDX https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/Catalog/OMNI/Composite_1982-88_Sector_Boundary NASA Catalog IMF Sector Boundaries 1982-1988 Composite 2026-02-22T13:10:26 The IMF Sector Boundaries 1982-1988 Composite from the Wilcox Solar Observatory is a catalog listing well-defined interplanetary magnetic field sector boundaries and heliospheric current sheet crossings. It uses daily polarity distributions and in situ plasma/magnetic field data. Omnitape Data: Hourly or daily averaged solar wind velocity, density, and magnetic field polarity reversal measurements from near-Earth spacecraft archives. Composite Computations: Combined actual spacecraft measurements with inferred daily polarities from ground-based geomagnetic data to fill missing intervals. Boundary Criteria: Identified via clear spiral field polarity reversals paired with typical heliospheric current sheet plasma signatures (low velocity and high density). spase://SMWG/Person/Xuepu.Zhao Author spase://SMWG/Person/Olga.Y.Uritskaya MetadataContact spase://SMWG/Repository/WSO http://wso.stanford.edu/SB/SBlist1.html HTML spase://SMWG/Instrument/OMNI SectorBoundaryCrossing 1982-06-23T00:00:00 1988-10-05T00:00:00 Date Temporal Polarity indicators The composite polarity (the computed daily polarity plus the inferred daily polarity replacing the missising data) daily polarity distributions by using a modified definition of the "well-defined" sector boundary. Here "+" refers to a UT day of outward polarity; "-" to a day of inward polarity and ":" to a day of mixed polarity. Other