The OMNI dataset contains near-Earth solar wind, plasma, and magnetic field data from current and former satellites. These data help shed light on how activity from the Sun affects Earth’s atmosphere and weather. The name “OMNI” reflects the variety of the dataset and is stylized in all caps. 

OMNI data span from 1963, when the Explorer 18 satellite was launched, to present day. Modern satellites that continually provide new data to the OMNI dataset include the Advanced Composition Explorer (ACE), the Global Geospace Science (GGS) Wind spacecraft, and the Deep Space Climate Observatory (DSCOVR). 

In a survey of seven top heliophysics journals, OMNI and/or OMNIWeb were referenced in 408 papers in the year 2022 alone, with the mentions of OMNI having steadily increased year over year. The extensive collection of historical solar wind data and the regular updates to the dataset make OMNI an invaluable asset for understanding the past and present of the Earth-Sun relationship. 

OMNI data are accessible via the OMNIWeb portal, which also allows users to create plots from the dataset. Access OMNIWeb here.