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Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Geophysical Research: Space Physics, 108, 2003, A6 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Kepko, L. Spence, H. E. Kepko, L. Spence, H. E. |
|---|---|
| author |
Kepko, L. Spence, H. E. |
| spellingShingle |
Kepko, L. Spence, H. E. Journal of Geophysical Research: Space Physics Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
kepko, l. |
| spelling |
Kepko, L. Spence, H. E. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2002ja009676 <jats:p>In this paper we present six events in which both the time series and the spectral content of solar wind number density fluctuations and magnetospheric magnetic field observations were highly correlated for intervals ranging from a few to twelve hours. The fluctuations were periodic and occurred at discrete frequencies which often matched the <jats:italic>f</jats:italic> = 1.3, 1.9, 2.6, and 3.4 mHz oscillations that have been attributed to global magnetospheric MHD cavity and/or waveguide modes. We also observed significant power in the sub‐mHz region, with frequencies as low as <jats:italic>f</jats:italic> = 0.1 mHz. We show that these fluctuations were first observed in the solar wind, far upstream from the Earth, and argue that the convected density perturbations slowly alter the size of the magnetospheric cavity leading to the appearance of multiple, discrete magnetospheric oscillations. We argue that for these events the discrete frequencies were an inherent property of the solar wind and were not related to a possible cavity or waveguide mode of the magnetosphere. We then show that the density fluctuations, when converted into length scales, organize into scale sizes of <jats:italic>L</jats:italic> = 23, 30, 45, and 80–100 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>. Finally, we speculate on a possible solar source for the periodic solar wind structures.</jats:p> Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations Journal of Geophysical Research: Space Physics |
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10.1029/2002ja009676 |
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Online Free |
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Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie |
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| title |
Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_unstemmed |
Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_full |
Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_fullStr |
Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_full_unstemmed |
Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_short |
Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_sort |
observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2002ja009676 |
| publishDate |
2003 |
| physical |
|
| description |
<jats:p>In this paper we present six events in which both the time series and the spectral content of solar wind number density fluctuations and magnetospheric magnetic field observations were highly correlated for intervals ranging from a few to twelve hours. The fluctuations were periodic and occurred at discrete frequencies which often matched the <jats:italic>f</jats:italic> = 1.3, 1.9, 2.6, and 3.4 mHz oscillations that have been attributed to global magnetospheric MHD cavity and/or waveguide modes. We also observed significant power in the sub‐mHz region, with frequencies as low as <jats:italic>f</jats:italic> = 0.1 mHz. We show that these fluctuations were first observed in the solar wind, far upstream from the Earth, and argue that the convected density perturbations slowly alter the size of the magnetospheric cavity leading to the appearance of multiple, discrete magnetospheric oscillations. We argue that for these events the discrete frequencies were an inherent property of the solar wind and were not related to a possible cavity or waveguide mode of the magnetosphere. We then show that the density fluctuations, when converted into length scales, organize into scale sizes of <jats:italic>L</jats:italic> = 23, 30, 45, and 80–100 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>. Finally, we speculate on a possible solar source for the periodic solar wind structures.</jats:p> |
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| author | Kepko, L., Spence, H. E. |
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| description | <jats:p>In this paper we present six events in which both the time series and the spectral content of solar wind number density fluctuations and magnetospheric magnetic field observations were highly correlated for intervals ranging from a few to twelve hours. The fluctuations were periodic and occurred at discrete frequencies which often matched the <jats:italic>f</jats:italic> = 1.3, 1.9, 2.6, and 3.4 mHz oscillations that have been attributed to global magnetospheric MHD cavity and/or waveguide modes. We also observed significant power in the sub‐mHz region, with frequencies as low as <jats:italic>f</jats:italic> = 0.1 mHz. We show that these fluctuations were first observed in the solar wind, far upstream from the Earth, and argue that the convected density perturbations slowly alter the size of the magnetospheric cavity leading to the appearance of multiple, discrete magnetospheric oscillations. We argue that for these events the discrete frequencies were an inherent property of the solar wind and were not related to a possible cavity or waveguide mode of the magnetosphere. We then show that the density fluctuations, when converted into length scales, organize into scale sizes of <jats:italic>L</jats:italic> = 23, 30, 45, and 80–100 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>. Finally, we speculate on a possible solar source for the periodic solar wind structures.</jats:p> |
| doi_str_mv | 10.1029/2002ja009676 |
| facet_avail | Online, Free |
| finc_class_facet | Geographie, Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft, Biologie, Allgemeine Naturwissenschaft, Physik, Technik, Geologie und Paläontologie |
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| imprint_str_mv | American Geophysical Union (AGU), 2003 |
| institution | DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161 |
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| physical | |
| publishDate | 2003 |
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| publisher | American Geophysical Union (AGU) |
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| spelling | Kepko, L. Spence, H. E. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2002ja009676 <jats:p>In this paper we present six events in which both the time series and the spectral content of solar wind number density fluctuations and magnetospheric magnetic field observations were highly correlated for intervals ranging from a few to twelve hours. The fluctuations were periodic and occurred at discrete frequencies which often matched the <jats:italic>f</jats:italic> = 1.3, 1.9, 2.6, and 3.4 mHz oscillations that have been attributed to global magnetospheric MHD cavity and/or waveguide modes. We also observed significant power in the sub‐mHz region, with frequencies as low as <jats:italic>f</jats:italic> = 0.1 mHz. We show that these fluctuations were first observed in the solar wind, far upstream from the Earth, and argue that the convected density perturbations slowly alter the size of the magnetospheric cavity leading to the appearance of multiple, discrete magnetospheric oscillations. We argue that for these events the discrete frequencies were an inherent property of the solar wind and were not related to a possible cavity or waveguide mode of the magnetosphere. We then show that the density fluctuations, when converted into length scales, organize into scale sizes of <jats:italic>L</jats:italic> = 23, 30, 45, and 80–100 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub>. Finally, we speculate on a possible solar source for the periodic solar wind structures.</jats:p> Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations Journal of Geophysical Research: Space Physics |
| spellingShingle | Kepko, L., Spence, H. E., Journal of Geophysical Research: Space Physics, Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_full | Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_fullStr | Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_full_unstemmed | Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_short | Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_sort | observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| title_unstemmed | Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2002ja009676 |