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The extreme-ultraviolet emission from sun-grazing comets
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bryans, Paul Pesnell, William D. |
| Copyright Year | 2012 |
| Description | The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses.We explain this EUV emission by considering the evolution of the cometary atmosphere as it interacts with the ambient solar atmosphere. Molecules in the comet rapidly sublimate as it approaches the Sun. They are then photodissociated by the solar radiation field to create atomic species. Subsequent ionization of these atoms produces a higher abundance of ions than normally present in the corona and results in EUV emission in the wavelength ranges of the AIA telescope passbands. |
| File Size | 607525 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140002244 |
| Archival Resource Key | ark:/13960/t7bs3sf45 |
| Language | English |
| Publisher Date | 2012-10-30 |
| Access Restriction | Open |
| Subject Keyword | Comets Solar Corona Comets C2/2011 N3 & C/2011 W3 Cometary Atmospheres Imaging Techniques Grazing Sun Helioseismology Coronas Radiation Distribution Radiance Ionization Extreme Ultraviolet Radiation Solar Radiation Ultraviolet Emission Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
