STANFORD UNIV CA HANSEN EXPERIMENTAL PHYSICS LAB
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The dynamic changes of solar magnetic fields generate coronal mass ejections CMEs, interplanetary shocks and southward interplanetary magnetic field IMF events, and geomagnetic disturbances. We seek to understand the solar causes of geomagnetic disturbances, especially how CMEs are associated with the changes of photospheric magnetic fields on both large and small scales, which characteristics of CMEs determine the duration and intensity of southward IMF events, and what function the ambient magnetic field and plasma in the heliosphere play in the formation of Bs events. We are working to develop tools that reliably forecast, from photospheric observations, the solar events and solar wind conditions that result in bad space weather.