Dst Profile Investigation of Long-Lasting Storms with Gamma Distribution and Diffusion-Like Distribution
Abstract
In this study, we focus on the Disturbance Storm Time (Dst) profile of long-lasting storms, which usually dips in a geomagnetic storm. Dst profiles are investigated with an inductive approach using the Gamma distribution function proportional to 1/(x^(k-1)) multiplied by exp(-theta*x). Energy dissipation is also modeled as a diffusion-like process where a 1-D diffusion profile would be equivalent to a Gamma distribution of k = 0.5. In an earlier study, profiles of fifteen storms were evaluated and analysis showed that a diffusion-like profile would serve as a better model compared to the Gamma distribution, suggesting the existence of a diffusion-like process in the energy dissipation in the Ring Current. Based on this result, the study was expanded to include 99 more Dst profiles (1998-2015). New methods are used to further the analysis in this study, including the addition of interplanetary structures (e.g., Corotating Interacting Region (CIRs), Sheath Field (SH), etc.) to categorize and explain patterns seen in Dst profiles. Our results so far show that sheath fields (SH) have the least deviation with each of their corresponding Gamma distribution functions as well as having a higher percentage of accurate fits.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMED31B0873D
- Keywords:
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- 0810 Post-secondary education;
- EDUCATIONDE: 0855 Diversity;
- EDUCATION