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IMF Sector Boundaries 1982-1988 Composite

2026-02-22 13:10:26

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).

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1982-06-23 00:00:00

1988-10-05 00:00:00

Date

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.