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The solar flare iron line to continuum ratio and the coronal abundances of iron and helium
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | McKenzie, D. L. |
| Copyright Year | 1975 |
| Description | Narrow band Ross filter measurements of the Fe 25 line flux around 0.185 nm and simultaneous broadband measurements during a solar flare were used to determine the relationship between the solar coronal abundances of iron and helium. The Fe 25 ion population was also determined as a function of time. The proportional counter and the Ross filter on OSO-7 were utilized. The data were analyzed under the separate assumptions that (1) the electron density was high enough that a single temperature could characterize the continuum spectrum and the ionization equilibrium, and that (2) the electron density was low so that the ion populations trailed the electron temperature in time. It was found that the density was at least 5x10 to the 9th power, and that the high density assumption was valid. It was also found that the iron abundance is 0.000011 for a helium abundance of 0.2, relative to hydrogen. |
| File Size | 1055979 |
| Page Count | 39 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760009923 |
| Archival Resource Key | ark:/13960/t9r25qp1t |
| Language | English |
| Publisher Date | 1975-04-29 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Solar Spectra Solar Corona Solar Flares Electron Density Concentration Proportional Counters Ions Abundance Oso-7 Iron Line Spectra Electron Energy Helium Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
