Browsing by Author "Parker, Jacob Douglas"

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Animations associated with Chapter 4 of thesis by Jacob Douglas Parker, "First Flight of the Extreme-ultraviolet Snapshot Imaging Spectrograph (ESIS)"
(Montana State University, 2021-11) Parker, Jacob Douglas
Animations associated with Figures 4.9, 4.11, 4.13, and 4.14, from the Chapter titled "First Flight of the Extreme-ultraviolet Snapshot Imaging Spectrograph (ESIS)". Ani_4_9.mp4 shows Level-3 difference images from the entire ESIS imaging sequence. Ani_4_11.mp4 shows the Level-3 difference movie of the spatially extended eruption captured by ESIS, and the associated Level-3 images (along the top row). It also shows co-temporal data from the 304, 171, and 193 angstrom AIA channels along the bottom row for comparison. Animations Ani_4_13.mp4 and Ani_4_14.mp4 show the temporal evolution of the MART inverted line profiles at 9 spatial locations across both explosive events inverted and discussed in Chapter 4, events c and d.
Novel models and observations of energetic events in the solar transition region
(Montana State University - Bozeman, College of Letters & Science, 2021) Parker, Jacob Douglas; Chairperson, Graduate Committee: Charles C. Kankelborg; Dana Longcope was a co-author of the article, 'Modeling a propagating sawtooth flare ribbon as a tearing mode in the presence of velocity shear' in the journal 'Astrophysical journal' which is contained within this dissertation.; Charles Kankelborg was a co-author of the article, 'Determining the spectral content of MOSES images' submitted to the journal 'Astrophysical journal' which is contained within this dissertation.; Roy Smart, Charles Kankelborg, Amy Winebarger and Nelson Goldsworth were co-authors of the article, 'First flight of the EUV snapshot imaging spectrograph (ESIS)' submitted to the journal 'Astrophysical journal' which is contained within this dissertation.
The solar atmosphere is an energetic and violent place capable of producing eruptions that affect us on earth. In order to better understand these events, so that we might improve out ability to model and predict them, we observe the sun from space to diagnose the local plasma conditions and track its evolution. The transition region, a thin region of the solar atmosphere separating the chromosphere from the corona, is where the solar atmosphere transitions rapidly from ten thousand, to one million kelvin and is therefore thought to play an important roll in the transfer of mass and energy to the hot corona. The sun's magnetic field, and magnetic reconnection, are thought to contribute to the increased temperature of the corona, since the cooler lower solar atmosphere cannot heat it via thermal conduction or convection. Explosive events, small solar eruptions likely driven by magnetic reconnection, are frequent in the transition region, making it an attractive area of the atmosphere to study and gather information on the processes. Using Computed Tomography Imaging Spectrographs (CTIS), capable of measuring spectral line profiles over a wide fields of view at every exposure, we find many eruptive events in the transition region to be spatially complex, three dimensional, and to evolve on rapid timescales. This demonstrates the utility of, and need to continue developing, CTIS style instruments for solar study since they provide a more complete picture of solar events, allowing us to improve our understanding of our closest star.