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Energetic electrons in impulsive solar flares
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Batchelor, D. A. |
| Copyright Year | 1984 |
| Description | A new analysis was made of a thermal flare model proposed by Brown, Melrose, and Spicer (1979) and Smith and Lilliequist (1979). They assumed the source of impulsive hard X-rays to be a plasma at a temperature of order 10 to the 8th power K, initially located at the apex of a coronal arch, and confined by ion-acoustic turbulence in a collisionless conduction front. Such a source would expand at approximately the ion-sound speed, C sub S = square root of (k T sub e/m sub i), until it filled the arch. Brown, Melrose, and Spicer and Smith and Brown (1980) argued that the source assumed in this model would not explain the simultaneous impulsive microwave emission. In contrast, the new results presented herein suggest that this model leads to the development of a quasi-Maxwellian distribution of electrons that explains both the hard X-ray and microwave emissions. This implies that the source sizes can be determined from observations of the optically-thick portions of microwave spectra and the temperatures obtained from associated hard X-ray observations. In this model, the burst emission would rise to a maximum in a time, t sub r, approximately equal to L/c sub s, where L is the half-length of the arch. New observations of these impulsive flare emissions were analyzed herein to test this prediction of the model. Observations made with the Solar Maximum Mission spacecraft and the Bern Radio Observatory are in good agreement with the model. |
| File Size | 5819915 |
| Page Count | 183 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840016451 |
| Archival Resource Key | ark:/13960/t4sj69x52 |
| Language | English |
| Publisher Date | 1984-05-01 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Solar Corona Electron Distribution Solar Maximum Mission Solar Spectrometers Solar Electrons Spectrum Analysis Spectral Emission Temporal Resolution Optical Thickness Microwave Spectra Synchrotron Radiation Microwaves High Temperature Plasmas Solar Flares Ion Acoustic Waves Bremsstrahlung Maxwell-boltzmann Density Function High Energy Electrons Solar X-rays Flux Density Bursts X Ray Spectra Spatial Resolution Solar Magnetic Field Microwave Emission Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Thesis |
