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Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Journal of Geophysical Research: Space Physics, 117, 2012, A1 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Balan, N. Liu, J. Y. Otsuka, Y. Tulasi Ram, S. Lühr, H. Balan, N. Liu, J. Y. Otsuka, Y. Tulasi Ram, S. Lühr, H. |
|---|---|
| author |
Balan, N. Liu, J. Y. Otsuka, Y. Tulasi Ram, S. Lühr, H. |
| spellingShingle |
Balan, N. Liu, J. Y. Otsuka, Y. Tulasi Ram, S. Lühr, H. Journal of Geophysical Research: Space Physics Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP 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 |
balan, n. |
| spelling |
Balan, N. Liu, J. Y. Otsuka, Y. Tulasi Ram, S. Lühr, H. 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/10.1029/2011ja016903 <jats:p>Analysis of the dayside electron density (Ne) and neutral mass density (N) at 400 km height measured by CHAMP during 12 intense geomagnetic storms in 2000–2004, and ion densities at 600 km and 840 km heights measured by ROCSAT and DMSP during a few of the intense storms, reveal some new aspects. Thermospheric storms (change of N) reach the equator within 1.5 to 3 hours from the main phase (MP) onset of intense storms having short and steady MPs. The responses of the equatorial ionosphere (at CHAMP) to both MPs and RPs (recovery phases) of the storms are generally opposite to those at higher latitudes. In addition to the known opposite responses during MPs, the analysis reveals that positive ionospheric storms develop at equatorial latitudes (within about ±15° magnetic latitudes) during daytime RPs, while conventional negative storms occur at higher latitudes. Ionospheric storms also extend to the topside ionosphere beyond 850 km height and are generally positive (at DMSP), especially during MPs. The positive storms around the equatorial ionospheric peak during RPs are interpreted in terms of the potential sources such as (1) zero or westward electric fields due to disturbance dynamo and/or prompt penetration, (2) plasma convergence due to the mechanical effects of storm‐time equatorward neutral winds and waves, (3) increase of atomic oxygen density and decrease of molecular nitrogen density due to the downwelling effect of the winds, and (4) photoionization. The positive storms in the topside ionosphere during MPs involve the rapid upward drift of plasma due to eastward PPEFs, reduction in the downward diffusion of plasma along the field lines, and plasma convergence due to equatorward winds and waves.</jats:p> Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP Journal of Geophysical Research: Space Physics |
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Biologie Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft |
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| title |
Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_unstemmed |
Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_full |
Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_fullStr |
Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_full_unstemmed |
Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_short |
Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_sort |
ionospheric and thermospheric storms at equatorial latitudes observed by champ, rocsat, and dmsp |
| 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/10.1029/2011ja016903 |
| publishDate |
2012 |
| physical |
|
| description |
<jats:p>Analysis of the dayside electron density (Ne) and neutral mass density (N) at 400 km height measured by CHAMP during 12 intense geomagnetic storms in 2000–2004, and ion densities at 600 km and 840 km heights measured by ROCSAT and DMSP during a few of the intense storms, reveal some new aspects. Thermospheric storms (change of N) reach the equator within 1.5 to 3 hours from the main phase (MP) onset of intense storms having short and steady MPs. The responses of the equatorial ionosphere (at CHAMP) to both MPs and RPs (recovery phases) of the storms are generally opposite to those at higher latitudes. In addition to the known opposite responses during MPs, the analysis reveals that positive ionospheric storms develop at equatorial latitudes (within about ±15° magnetic latitudes) during daytime RPs, while conventional negative storms occur at higher latitudes. Ionospheric storms also extend to the topside ionosphere beyond 850 km height and are generally positive (at DMSP), especially during MPs. The positive storms around the equatorial ionospheric peak during RPs are interpreted in terms of the potential sources such as (1) zero or westward electric fields due to disturbance dynamo and/or prompt penetration, (2) plasma convergence due to the mechanical effects of storm‐time equatorward neutral winds and waves, (3) increase of atomic oxygen density and decrease of molecular nitrogen density due to the downwelling effect of the winds, and (4) photoionization. The positive storms in the topside ionosphere during MPs involve the rapid upward drift of plasma due to eastward PPEFs, reduction in the downward diffusion of plasma along the field lines, and plasma convergence due to equatorward winds and waves.</jats:p> |
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| author | Balan, N., Liu, J. Y., Otsuka, Y., Tulasi Ram, S., Lühr, H. |
| author_facet | Balan, N., Liu, J. Y., Otsuka, Y., Tulasi Ram, S., Lühr, H., Balan, N., Liu, J. Y., Otsuka, Y., Tulasi Ram, S., Lühr, H. |
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| description | <jats:p>Analysis of the dayside electron density (Ne) and neutral mass density (N) at 400 km height measured by CHAMP during 12 intense geomagnetic storms in 2000–2004, and ion densities at 600 km and 840 km heights measured by ROCSAT and DMSP during a few of the intense storms, reveal some new aspects. Thermospheric storms (change of N) reach the equator within 1.5 to 3 hours from the main phase (MP) onset of intense storms having short and steady MPs. The responses of the equatorial ionosphere (at CHAMP) to both MPs and RPs (recovery phases) of the storms are generally opposite to those at higher latitudes. In addition to the known opposite responses during MPs, the analysis reveals that positive ionospheric storms develop at equatorial latitudes (within about ±15° magnetic latitudes) during daytime RPs, while conventional negative storms occur at higher latitudes. Ionospheric storms also extend to the topside ionosphere beyond 850 km height and are generally positive (at DMSP), especially during MPs. The positive storms around the equatorial ionospheric peak during RPs are interpreted in terms of the potential sources such as (1) zero or westward electric fields due to disturbance dynamo and/or prompt penetration, (2) plasma convergence due to the mechanical effects of storm‐time equatorward neutral winds and waves, (3) increase of atomic oxygen density and decrease of molecular nitrogen density due to the downwelling effect of the winds, and (4) photoionization. The positive storms in the topside ionosphere during MPs involve the rapid upward drift of plasma due to eastward PPEFs, reduction in the downward diffusion of plasma along the field lines, and plasma convergence due to equatorward winds and waves.</jats:p> |
| doi_str_mv | 10.1029/2011ja016903 |
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| finc_class_facet | Biologie, Allgemeine Naturwissenschaft, Physik, Technik, Geologie und Paläontologie, Geographie, Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft |
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| imprint | American Geophysical Union (AGU), 2012 |
| imprint_str_mv | American Geophysical Union (AGU), 2012 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-D161, DE-Zwi2, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229 |
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| language | English |
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| mega_collection | American Geophysical Union (AGU) (CrossRef) |
| physical | |
| publishDate | 2012 |
| publishDateSort | 2012 |
| publisher | American Geophysical Union (AGU) |
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| series | Journal of Geophysical Research: Space Physics |
| source_id | 49 |
| spelling | Balan, N. Liu, J. Y. Otsuka, Y. Tulasi Ram, S. Lühr, H. 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/10.1029/2011ja016903 <jats:p>Analysis of the dayside electron density (Ne) and neutral mass density (N) at 400 km height measured by CHAMP during 12 intense geomagnetic storms in 2000–2004, and ion densities at 600 km and 840 km heights measured by ROCSAT and DMSP during a few of the intense storms, reveal some new aspects. Thermospheric storms (change of N) reach the equator within 1.5 to 3 hours from the main phase (MP) onset of intense storms having short and steady MPs. The responses of the equatorial ionosphere (at CHAMP) to both MPs and RPs (recovery phases) of the storms are generally opposite to those at higher latitudes. In addition to the known opposite responses during MPs, the analysis reveals that positive ionospheric storms develop at equatorial latitudes (within about ±15° magnetic latitudes) during daytime RPs, while conventional negative storms occur at higher latitudes. Ionospheric storms also extend to the topside ionosphere beyond 850 km height and are generally positive (at DMSP), especially during MPs. The positive storms around the equatorial ionospheric peak during RPs are interpreted in terms of the potential sources such as (1) zero or westward electric fields due to disturbance dynamo and/or prompt penetration, (2) plasma convergence due to the mechanical effects of storm‐time equatorward neutral winds and waves, (3) increase of atomic oxygen density and decrease of molecular nitrogen density due to the downwelling effect of the winds, and (4) photoionization. The positive storms in the topside ionosphere during MPs involve the rapid upward drift of plasma due to eastward PPEFs, reduction in the downward diffusion of plasma along the field lines, and plasma convergence due to equatorward winds and waves.</jats:p> Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP Journal of Geophysical Research: Space Physics |
| spellingShingle | Balan, N., Liu, J. Y., Otsuka, Y., Tulasi Ram, S., Lühr, H., Journal of Geophysical Research: Space Physics, Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP, 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 | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_full | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_fullStr | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_full_unstemmed | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_short | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| title_sort | ionospheric and thermospheric storms at equatorial latitudes observed by champ, rocsat, and dmsp |
| title_unstemmed | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| 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/10.1029/2011ja016903 |