Effects in the Geomagnetic Field and Absorption of Cosmic Radio Emission Caused by the Negative Pressure Discontinuity of the Solar Wind: Analysis of a Particular Event
| Autor: | E. A. Kasatkina, N. G. Kleimenova, O. I. Shumilov |
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| Rok vydání: | 2018 |
| Předmět: |
Geomagnetic storm
Physics COSMIC cancer database 010504 meteorology & atmospheric sciences Astrophysics::High Energy Astrophysical Phenomena Magnetosphere Astrophysics Impulse (physics) 01 natural sciences Physics::Geophysics Latitude Solar wind Geophysics Earth's magnetic field Space and Planetary Science Physics::Space Physics 0103 physical sciences Ionosphere 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Geomagnetism and Aeronomy. 58:9-15 |
| ISSN: | 1555-645X 0016-7932 |
| DOI: | 10.1134/s0016793218010140 |
| Popis: | An abrupt decrease in the solar wind pressure and its effect on the magnetosphere and ionosphere during the event occurring on April 4, 1971, are studied. This event differs fundamentally from a typical sudden commencement (SC) of a geomagnetic storm or from a positive sudden impulse (SI+) and is determined as a negative sudden impulse (SI–). The geomagnetic variations at different latitudes and the cosmic radio emission in the auroral zone are analyzed. From the data of low-latitude geomagnetic observatories, several subsequent negative impulses observed with a periodicity of ~45 min were found. At the same time, a sudden decrease in the absorption of cosmic radio emission in the auroral zone was revealed. Possible physical explanations of the observed changes are discussed. |
| Databáze: | OpenAIRE |
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