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/Sector_Boundary_Crossing NASA Catalog L. Svalgaard's Interplanetary Sector Boundary Crossing List https://doi.org/10.48322/b9m5-f869 2026-02-02T13:10:26Z 2023-05-11T12:34:56.789 Updated to SPASE Version 2.5.0 if needed, Added DOI information, JMW 2026-02-02T13:10:26Z Added MetadataRightsList. Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB 2026-07-23T19:09:33 The directory was changed. The broken links was replaced - access URL. Description updated. Time span changed. Contact end day added, parameters added, repository added, instrument added (OYU) This list of interplanetary sector boundary crossings has been compiled by Leif Svalgaard from ground magnetometer data and in situ interplanetary magnetic field observations Identification of the boundaries . For each crossing, the day of crossing, the direction of crossing (+to- or -to+) and the durations (in whole days) of single-polarity intervals on either side of the crossing are given. Leif Svalgaard for creating and maintaining this event list Leif Svalgaard 2022-01-01T00:00:00 Leif Svalgaard, Stanford University spase://SMWG/Person/Leif.Svalgaard DataProducer 2024-07-09T00:00:00 Leif Svalgaard passed away on 10.11.2025 spase://SMWG/Person/Olga.Y.Uritskaya MetadataContact spase://VSPO/Catalog/Svalgaard_SB_List spase://VSPO/Catalog/Svalgaard/Sector.Boundary.Crossing spase://NASA/Catalog/Svalgaard/Sector.Boundary.Crossing spase://SMWG/Repository/WSO Sector boundary crossing list http://wso.stanford.edu/SB/SB.html Text spase://SMWG/Instrument/OMNI SectorBoundaryCrossing 1926-01-29T00:00:00 2024-07-09T00:00:00 - , + Polarity indicators Other Date Temporal The quantity of days before boundary crossing Other The quantity of days after boundary crossing Other