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Drivers of chorus in the outer dayside magnetosphere
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Geophysical Research: Space Physics, 115, 2010, A4 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Spasojevic, M. Inan, U. S. Spasojevic, M. Inan, U. S. |
|---|---|
| author |
Spasojevic, M. Inan, U. S. |
| spellingShingle |
Spasojevic, M. Inan, U. S. Journal of Geophysical Research: Space Physics Drivers of chorus in the outer dayside magnetosphere 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 |
spasojevic, m. |
| spelling |
Spasojevic, M. Inan, U. S. 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/10.1029/2009ja014452 <jats:p>Using ELF/VLF wave data recorded in 2007 from two high‐latitude (Λ = 69.8°, 71.8°) Antarctic ground stations, the dayside variation of chorus wave occurrence and amplitude are analyzed in conjunction with geomagnetic and solar wind driving parameters. Both stations observe chorus (defined here as discrete rising emission tones together with unstructured hiss) in a broad window of local time across the dayside when the stations are on closed magnetic field lines. Wave occurrence rates rise rapidly from ∼0.06–0.12 at dawn to their maximum value of ∼0.5–0.6 near local noon. The event amplitudes also peak near noon. Occurrence probabilities at the lower‐latitude station are consistently higher with the average difference in the rate between the two stations being 0.15. In addition, ∼80% of the time, event amplitudes are larger at the lower‐latitude site. When the stations are in the dawn local time sector (5.5 < MLT < 10), the onset of waves is clearly linked to substorms, as seen by the <jats:italic>AE</jats:italic> index as well as by energetic electron injections observed at geosynchronous orbit. However, as the stations rotate to noon (MLT > 10), wave occurrence rates appear to be relatively independent of geomagnetic activity as measured by <jats:italic>K</jats:italic><jats:sub>p</jats:sub> and <jats:italic>AE</jats:italic>. Chorus near noon at times appears related to substorm activity, but intense waves can also be observed during extended quiet periods. Waves across the entire dayside are more likely during higher solar wind dynamic pressure as well as during significant changes in pressure. We attribute the high occurrence rate of outer dayside chorus to several effects resulting from solar wind compression of the dayside magnetosphere; the first is electron drift shell splitting, and the second is the creation of a region of high magnetic field homogeneity which is particularly favorable for wave growth.</jats:p> Drivers of chorus in the outer dayside magnetosphere Journal of Geophysical Research: Space Physics |
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10.1029/2009ja014452 |
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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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Drivers of chorus in the outer dayside magnetosphere |
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Drivers of chorus in the outer dayside magnetosphere |
| title_full |
Drivers of chorus in the outer dayside magnetosphere |
| title_fullStr |
Drivers of chorus in the outer dayside magnetosphere |
| title_full_unstemmed |
Drivers of chorus in the outer dayside magnetosphere |
| title_short |
Drivers of chorus in the outer dayside magnetosphere |
| title_sort |
drivers of chorus in the outer dayside magnetosphere |
| 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 |
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http://dx.doi.org/10.1029/2009ja014452 |
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<jats:p>Using ELF/VLF wave data recorded in 2007 from two high‐latitude (Λ = 69.8°, 71.8°) Antarctic ground stations, the dayside variation of chorus wave occurrence and amplitude are analyzed in conjunction with geomagnetic and solar wind driving parameters. Both stations observe chorus (defined here as discrete rising emission tones together with unstructured hiss) in a broad window of local time across the dayside when the stations are on closed magnetic field lines. Wave occurrence rates rise rapidly from ∼0.06–0.12 at dawn to their maximum value of ∼0.5–0.6 near local noon. The event amplitudes also peak near noon. Occurrence probabilities at the lower‐latitude station are consistently higher with the average difference in the rate between the two stations being 0.15. In addition, ∼80% of the time, event amplitudes are larger at the lower‐latitude site. When the stations are in the dawn local time sector (5.5 < MLT < 10), the onset of waves is clearly linked to substorms, as seen by the <jats:italic>AE</jats:italic> index as well as by energetic electron injections observed at geosynchronous orbit. However, as the stations rotate to noon (MLT > 10), wave occurrence rates appear to be relatively independent of geomagnetic activity as measured by <jats:italic>K</jats:italic><jats:sub>p</jats:sub> and <jats:italic>AE</jats:italic>. Chorus near noon at times appears related to substorm activity, but intense waves can also be observed during extended quiet periods. Waves across the entire dayside are more likely during higher solar wind dynamic pressure as well as during significant changes in pressure. We attribute the high occurrence rate of outer dayside chorus to several effects resulting from solar wind compression of the dayside magnetosphere; the first is electron drift shell splitting, and the second is the creation of a region of high magnetic field homogeneity which is particularly favorable for wave growth.</jats:p> |
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| author | Spasojevic, M., Inan, U. S. |
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| description | <jats:p>Using ELF/VLF wave data recorded in 2007 from two high‐latitude (Λ = 69.8°, 71.8°) Antarctic ground stations, the dayside variation of chorus wave occurrence and amplitude are analyzed in conjunction with geomagnetic and solar wind driving parameters. Both stations observe chorus (defined here as discrete rising emission tones together with unstructured hiss) in a broad window of local time across the dayside when the stations are on closed magnetic field lines. Wave occurrence rates rise rapidly from ∼0.06–0.12 at dawn to their maximum value of ∼0.5–0.6 near local noon. The event amplitudes also peak near noon. Occurrence probabilities at the lower‐latitude station are consistently higher with the average difference in the rate between the two stations being 0.15. In addition, ∼80% of the time, event amplitudes are larger at the lower‐latitude site. When the stations are in the dawn local time sector (5.5 < MLT < 10), the onset of waves is clearly linked to substorms, as seen by the <jats:italic>AE</jats:italic> index as well as by energetic electron injections observed at geosynchronous orbit. However, as the stations rotate to noon (MLT > 10), wave occurrence rates appear to be relatively independent of geomagnetic activity as measured by <jats:italic>K</jats:italic><jats:sub>p</jats:sub> and <jats:italic>AE</jats:italic>. Chorus near noon at times appears related to substorm activity, but intense waves can also be observed during extended quiet periods. Waves across the entire dayside are more likely during higher solar wind dynamic pressure as well as during significant changes in pressure. We attribute the high occurrence rate of outer dayside chorus to several effects resulting from solar wind compression of the dayside magnetosphere; the first is electron drift shell splitting, and the second is the creation of a region of high magnetic field homogeneity which is particularly favorable for wave growth.</jats:p> |
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| spelling | Spasojevic, M. Inan, U. S. 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/10.1029/2009ja014452 <jats:p>Using ELF/VLF wave data recorded in 2007 from two high‐latitude (Λ = 69.8°, 71.8°) Antarctic ground stations, the dayside variation of chorus wave occurrence and amplitude are analyzed in conjunction with geomagnetic and solar wind driving parameters. Both stations observe chorus (defined here as discrete rising emission tones together with unstructured hiss) in a broad window of local time across the dayside when the stations are on closed magnetic field lines. Wave occurrence rates rise rapidly from ∼0.06–0.12 at dawn to their maximum value of ∼0.5–0.6 near local noon. The event amplitudes also peak near noon. Occurrence probabilities at the lower‐latitude station are consistently higher with the average difference in the rate between the two stations being 0.15. In addition, ∼80% of the time, event amplitudes are larger at the lower‐latitude site. When the stations are in the dawn local time sector (5.5 < MLT < 10), the onset of waves is clearly linked to substorms, as seen by the <jats:italic>AE</jats:italic> index as well as by energetic electron injections observed at geosynchronous orbit. However, as the stations rotate to noon (MLT > 10), wave occurrence rates appear to be relatively independent of geomagnetic activity as measured by <jats:italic>K</jats:italic><jats:sub>p</jats:sub> and <jats:italic>AE</jats:italic>. Chorus near noon at times appears related to substorm activity, but intense waves can also be observed during extended quiet periods. Waves across the entire dayside are more likely during higher solar wind dynamic pressure as well as during significant changes in pressure. We attribute the high occurrence rate of outer dayside chorus to several effects resulting from solar wind compression of the dayside magnetosphere; the first is electron drift shell splitting, and the second is the creation of a region of high magnetic field homogeneity which is particularly favorable for wave growth.</jats:p> Drivers of chorus in the outer dayside magnetosphere Journal of Geophysical Research: Space Physics |
| spellingShingle | Spasojevic, M., Inan, U. S., Journal of Geophysical Research: Space Physics, Drivers of chorus in the outer dayside magnetosphere, 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 | Drivers of chorus in the outer dayside magnetosphere |
| title_full | Drivers of chorus in the outer dayside magnetosphere |
| title_fullStr | Drivers of chorus in the outer dayside magnetosphere |
| title_full_unstemmed | Drivers of chorus in the outer dayside magnetosphere |
| title_short | Drivers of chorus in the outer dayside magnetosphere |
| title_sort | drivers of chorus in the outer dayside magnetosphere |
| title_unstemmed | Drivers of chorus in the outer dayside magnetosphere |
| 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/10.1029/2009ja014452 |