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Discovery of finely structured dynamic solar corona observed in the hi-c telescope
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Cirtain, J. Schuler, T. Alexander, C. Golub, L. DeLuca, E. Savage, S. Winebarger, A. |
| Copyright Year | 2014 |
| Description | In the summer of 2012, the High-resolution Coronal Imager (Hi-C) flew aboard a NASA sounding rocket and collected the highest spatial resolution images ever obtained of the solar corona. One of the goals of the Hi-C flight was to characterize the substructure of the solar corona. We therefore examine how the intensity scales from AIA resolution to Hi-C resolution. For each low-resolution pixel, we calculate the standard deviation in the contributing high-resolution pixel intensities and compare that to the expected standard deviation calculated from the noise. If these numbers are approximately equal, the corona can be assumed to be smoothly varying, i.e. have no evidence of substructure in the Hi-C image to within Hi-C's ability to measure it given its throughput and readout noise. A standard deviation much larger than the noise value indicates the presence of substructure. We calculate these values for each low-resolution pixel for each frame of the Hi-C data. On average, 70 percent of the pixels in each Hi-C image show no evidence of substructure. The locations where substructure is prevalent is in the moss regions and in regions of sheared magnetic field. We also find that the level of substructure varies significantly over the roughly 160 s of the Hi-C data analyzed here. This result indicates that the finely structured corona is concentrated in regions of heating and is highly time dependent. |
| File Size | 6242648 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140011695 |
| Archival Resource Key | ark:/13960/t0gv0m30j |
| Language | English |
| Publisher Date | 2014-06-01 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Substructures Time Dependence Solar Corona High Resolution Heating Standard Deviation Magnetic Fields Spatial Resolution Sounding Rockets Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
