Planetary Science Directorate


Upcoming SwRI Boulder Colloquia

Colloquia are normally on Tuesdays at 11:00 am in the 4th-floor conference room, except as indicated below in bold text.
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For questions or suggestions for speakers, please contact the SwRI colloquium organizers:
Derek Lamb, 720-208-7207 or derek(at)
Raluca Rufu, 303-226-0879 or raluca(at)
Julien Salmon, 720-208-7203 or julien(at)
Kelsi Singer, 303-226-5910 or ksinger(at)

To be added to the SwRI Boulder Colloquia email list, please contact Kelsi Singer, ksinger(at)

Thu Sep 23, 2021
In Virtual
11:00 am Maurice Wilson Harvard CfA Spectroscopic constraints on the solar CME heating problem with the SOHO/UVCS instrument
Abstract: Solar coronal mass ejections (CMEs) commence as violent magnetic storms that release massive amounts of plasma and magnetic energy into the solar corona and interplanetary medium. It is difficult to measure all forms of energy within the CME's total energy budget, especially the magnetic energy and cumulative heating energy. The coronal heating problem is a hot topic that often eclipses the CME heating problem, but a few studies are proving that the cumulative heating energy is a significant component of the CME energy budget that is just as misunderstood as the heating of the ambient corona. We determine the heating and energy budget of a CME observed in 1999 with the UVCS instrument on board the SOHO spacecraft. We use velocity-sensitive plasma diagnostics to study the single-slit UVCS measurements of localized plasma within the CME that was captured serendipitously at multiple heights in the corona. We find that the cumulative heating energy is comparable to the kinetic energy of the CME's core, which travels at 250 km/s at heliocentric distances near 3.0 solar radii.