High-latitude distributions of plasma waves and spatial irregularities from DE 2 alternating current electric field observations
| Autor: | N. C. Maynard, J. P. Heppner, M. C. Liebrecht, Robert F. Pfaff |
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| Rok vydání: | 1993 |
| Předmět: |
Physics
Atmospheric Science Hiss Ecology business.industry Paleontology Soil Science Spectral density Magnetosphere Forestry Aquatic Science Oceanography Polarization (waves) Alfvén wave Geophysics Optics Space and Planetary Science Geochemistry and Petrology Electric field Earth and Planetary Sciences (miscellaneous) Ionosphere Electric current business Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research: Space Physics. 98:1629-1652 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/92ja01836 |
| Popis: | The high-latitude spatial distributions of average signal intensities in 12 frequency channels between 4 Hz and 512 kHz as measured by the ac electric field spectrometers on the DE-2 spacecraft are analyzed for 18 mo of measurements. In MLT-INL (magnetic local time-invariant latitude) there are three distinct distributions that can be identified with 4-512 Hz signals from spatial irregularities and Alfven waves, 256-Hz to 4.1-kHz signals from ELF hiss, and 4.1-64 kHz signals from VLF auroral hiss, respectively. Overlap between ELF hiss and spatial irregularity signals occurs in the 256-512 Hz band. VLF hiss signals extend downward in frequency into the 1.0-4.1 kHz band and upward into the frequency range 128-512 kHz. The distinctly different spatial distribution patterns for the three bands, 4-256 Hz, 512-1204 Hz, and 4.1-64 kHz, indicate a lack of any causal relationships between VLF hiss, ELF hiss, and lower-frequency signals from spatial irregularities and Alfven waves. |
| Databáze: | OpenAIRE |
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