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Full-Text Articles in Physical Sciences and Mathematics
Relationship Between Solar Energetic Particle He/H Abundance Ratios And Properties Of Flares And Cmes, Christopher R. Davidson
Relationship Between Solar Energetic Particle He/H Abundance Ratios And Properties Of Flares And Cmes, Christopher R. Davidson
Theses and Dissertations
Previous studies have investigated the He/H elemental abundance ratios of Solar Energetic Particle (SEP) Events of energies above 4 MeV. Also, studies have investigated the correlations between SEPs, Coronal Mass Ejections (CME), and Solar Flares. This work finds the correlations between the >4 MeV He/H abundance ratios and the solar parameters from the SEP, CME, and solar flare associated with the abundance increases. 43 SEP events located at solar west longitude are analyzed to find the correlation coefficients. Highly significant correlation was found between the He/H abundance ratios and the following parameters: solar flare flux, solar flare fluence, CME linear …
Development And Verification Of Extreme Space Weather Phenomena Models, Sophia G. Schwalbe
Development And Verification Of Extreme Space Weather Phenomena Models, Sophia G. Schwalbe
Theses and Dissertations
A range of 14 M-class flares from 1 June 2015 to 27 September 2016 were analyzed to find significant trends in electron frequency profile modeling using the GLobal airglOW (GLOW) model and radar parameters using a ray tracing algorithm developed by the Air Force Research Laboratory. GLOW was run for all the flares using three different solar spectrum schemes and an average of the three: the Hinteregger method, EUV flux model for aeronomic calculations (EUVAC), and a rebinned Flare Irradiance Spectrum Model (FISM) result. Comparing data for the E-layer where GLOW is most accurate, it was determined that GLOW using …
Ionospheric Response To Solar Flares Using An Improved Version Of Sami2, Joseph P. Reich Iii
Ionospheric Response To Solar Flares Using An Improved Version Of Sami2, Joseph P. Reich Iii
Theses and Dissertations
Solar flares release energy, primarily at X-ray and EUV wavelengths, which is then absorbed mainly in Earth's ionosphere. This non-uniform absorption of energy alters the ionosphere's structure and can change the propagation of electromagnetic waves causing errors in GPS navigation, false radar echoes, and loss of High Frequency (HF) radio communications. Accurately modeling the ionospheric response to flares is the first step in predicting, and then mitigating, their effects. Accurately modeling these effects requires solar irradiance at a high cadence, to capture the flare, which may only last minutes, as well as treatment of the effects of photoelectrons. Sami2 is …