April 20, 2018, 1:00 pm - 2:00 pm

April 20, 2018, 1:00 pm - 2:00 pm, Heliophysics Director's Seminar, Hosted by the Solar Physics Laboratory (671)

Which EUV emission lines are sensitive to CME-induced coronal dimming?

James Mason (NASA Postdoctoral Fellow)

When coronal mass ejections (CMEs) depart the corona, they leave behind a transient void. Such a region evacuated of plasma is known as a coronal dimming and it contains information about the kinetics of the CME that produced it. The dimming can be so great in the extreme ultraviolet (EUV) that it reduces the overall energy output of the sun in particular emission lines, i.e., dimming is observable in spectral irradiance. We use the Solar Dynamics Observatory (SDO) EUV Variability Experiment (EVE) data to search for and parameterize dimming. We focus our search on the 39 extracted emission lines data product. We are searching these light curves for dimming around all of the >8,500 C1 solar flares in the SDO era. Our method of combining these 39 light curves to remove the flare peak results in 1,521 light curves for every solar flare. Thus, we come to a total of ~13 million light curves in which to search for dimming. The question is: which ones are sensitive to CME-induced dimming? The feature detection code, which utilizes machine learning techniques, is open source python available on GitHub (https://github.com/jmason86/James-s-EVE-Dimming-Index-JEDI).

Solar Physics on Terra Firma: Collaborating with DKIST

Don Schmit (The Catholic University of America)

The largest solar telescope (Daniel K. Inouye Solar Telescope) ever built is nearly completed on top of a volcano in Maui. This project that is led by the National Solar Observatory presents a unique opportunity for scientific collaboration with NASA Heliophysics missions and scientists. In anticipation of first light, our group has contributed to the Critical Science Plan for DKIST. In this talk, we will describe our work in developing observing proposals that advance solar physics through the joint analysis of DKIST and NASA data.

Milli-arcsecond Imaging of Solar and Stellar Corona with EUV Photon Sieves

Adrian Daw (NASA/GSFC 671)

Large aperture EUV photon sieves being developed and fabricated at Goddard have the ability to image emission lines of solar and stellar coronae with a spatial resolution as high as one thousandth of an arcsecond, and thus, finally image the expected energy dissipation scales for processes that drive coronal heating and solar eruptive events. The talk will present laboratory demonstrations of performance, and mission architectures that support photon sieve telescopes with the requisite alignment to address a number of science goals.