Survey of VLF-Omega transmissions received during summer in the Antarctic Peninsula
Preliminary results are presented for about one month of measurements of all existing VLF-Omega transmissions, performed by amplitude and phase tracking receivers controlled by atomic frequency standards operated at Brazilian Antarctic station Ferraz, in February 1984. For the purpose of comparison,...
| Main Authors: | , , |
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| Format: | Report |
| Language: | English |
| Published: |
Instituto de Pesquisas Espaciais (INPE)/Instituto de Pesquisas Espaciais (INPE)/Instituto de Pesquisas Espaciais (INPE)
1985
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1810 http://id.nii.ac.jp/1291/00001810/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1810&item_no=1&attribute_id=18&file_no=1 |
| Summary: | Preliminary results are presented for about one month of measurements of all existing VLF-Omega transmissions, performed by amplitude and phase tracking receivers controlled by atomic frequency standards operated at Brazilian Antarctic station Ferraz, in February 1984. For the purpose of comparison, simultaneous measurements were taken at Itapetinga Radio Observatory, near Sao Paulo by a single amplitude and phase tracking receiver. Basic propagation characteristics in phase variation, signal strength and nighttime modal interference were established for all transmissions, for at least three days each. A more detailed survey was performed on Omega-Argentina transmission, which was tracked for the whole period. These transmissions displayed systematic nighttime mode conversion effects, which are characteristic of the sudden phase delay peak at sunrise. The mean diurnal phase variation of Omega-Argentina transmissions, received at Ferraz, displayed diurnal phase variations much larger than expected at 13.6kHz, and much smaller at 10.2kHz. About 90 SID's produced by solar flares were measured for various transmissions. They were analyzed comparatively on different transmission paths. Although there were flare-produced proton particles detected at satellite altitudes during the observing period, no substantial change in diurnal phase variation was detected on Omega-Argentina transmissions received at Ferraz. |
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