dorsal/arxiv
View SchemaIonospheric HF pump wave triggering of local auroral activation
| Authors | N. F. Blagoveshchenskaya, V. A. Kornienko, T. D. Borisova, B. Thidé, M. J. Kosch, M. T. Rietveld, E. V. Mishin, R. Yu. Luk'yanova, O. A. Troshichev |
|---|---|
| Categories | |
| ArXiv ID | physics/9906057 |
| URL | https://arxiv.org/abs/physics/9906057 |
Abstract
Experimental results from Tromso HF pumping experiments in the nightside auroral E region are reported. We found intriguing evidence that a modification of the ionosphere-magnetosphere coupling, due to the effects of powerful HF waves beamed into an auroral sporadic E layer, can lead to a local intensification of the auroral activity. Summarizing multi-instrument ground-based observations and observations from the IMP 8 and IMP 9 satellites, one can distinguish the following peculiarities related to this auroral activation: modification of the auroral arc and its break-up above Tromso; local changes of the horizontal currents in the vicinity of Tromso; increase of the electron temperature and ion velocities at altitudes above the HF pump reflection level; distinctive features in dynamic HF radio scatter Doppler spectra; pump-induced electron precipitation; substorm activation exactly above Tromso. The mechanisms of the modification of the ionosphere-magnetosphere coupling through the excitation of the turbulent Alfven boundary layer between the base of the ionosphere (~100 km) and the level of sharp increase of the Alfven velocity (at heights up to one Earth radius), and the formation of a local magnetospheric current system are discussed. The results suggest that a possible triggering of local auroral activation requires specific geophysical conditions.
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"abstract": "Experimental results from Tromso HF pumping experiments in the nightside\nauroral E region are reported. We found intriguing evidence that a modification\nof the ionosphere-magnetosphere coupling, due to the effects of powerful HF\nwaves beamed into an auroral sporadic E layer, can lead to a local\nintensification of the auroral activity. Summarizing multi-instrument\nground-based observations and observations from the IMP 8 and IMP 9 satellites,\none can distinguish the following peculiarities related to this auroral\nactivation: modification of the auroral arc and its break-up above Tromso;\nlocal changes of the horizontal currents in the vicinity of Tromso; increase of\nthe electron temperature and ion velocities at altitudes above the HF pump\nreflection level; distinctive features in dynamic HF radio scatter Doppler\nspectra; pump-induced electron precipitation; substorm activation exactly above\nTromso. The mechanisms of the modification of the ionosphere-magnetosphere\ncoupling through the excitation of the turbulent Alfven boundary layer between\nthe base of the ionosphere (~100 km) and the level of sharp increase of the\nAlfven velocity (at heights up to one Earth radius), and the formation of a\nlocal magnetospheric current system are discussed. The results suggest that a\npossible triggering of local auroral activation requires specific geophysical\nconditions.",
"arxiv_id": "physics/9906057",
"authors": [
"N. F. Blagoveshchenskaya",
"V. A. Kornienko",
"T. D. Borisova",
"B. Thid\u00e9",
"M. J. Kosch",
"M. T. Rietveld",
"E. V. Mishin",
"R. Yu. Luk\u0027yanova",
"O. A. Troshichev"
],
"categories": [
"physics.space-ph",
"physics.plasm-ph"
],
"title": "Ionospheric HF pump wave triggering of local auroral activation",
"url": "https://arxiv.org/abs/physics/9906057"
},
"schema_id": "dorsal/arxiv",
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