Time delay and duration of ionospheric total electron content responses to geomagnetic disturbances.
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| Title: | Time delay and duration of ionospheric total electron content responses to geomagnetic disturbances. |
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| Authors: | Liu, J.1,2, Zhao, B.1, L. Liu1 |
| Source: | Annales Geophysicae (ANGEO) (09927689). Mar2010, Vol. 28 Issue 3, p795-805. 11p. 6 Graphs. |
| Subject Terms: | *Ionosphere, *Geomagnetism, *Ionospheric storms, *Electrons, *Latitude, *Winter |
| Geographic Terms: | United States |
| Company/Entity: | Jet Propulsion Laboratory (U.S.) |
| Abstract: | Although positive and negative signatures of ionospheric storms have been reported many times, global characteristics such as the time of occurrence, time delay and duration as well as their relations to the intensity of the ionospheric storms have not received enough attention. The 10 years of global ionosphere maps (GIMs) of total electron content (TEC) retrieved at Jet Propulsion Laboratory (JPL) were used to conduct a statistical study of the time delay of the ionospheric responses to geomagnetic disturbances. Our results show that the time delays between geomagnetic disturbances and TEC responses depend on season, magnetic local time and magnetic latitude. In the summer hemisphere at mid- and high latitudes, the negative storm effects can propagate to the low latitudes at post-midnight to the morningsector with a time delay of 4-7 h. As the earth rotates to the sunlight, negative phase retreats to higher latitudes and starts to extend to the lower latitude toward midnight sector. In the winter hemisphere during the daytime and after sunset at mid- and low latitudes, the negative phase appearance time is delayed from 1-10 h depending on the local time, latitude and storm intensity compared to the same area in the summer hemisphere. The quick response of positive phase can be observed at the auroral area in the night-side of the winter hemisphere. At the low latitudes during the dawn-noon sector, the ionospheric negative phase responses quickly with time delays of 5-7 h in both equinoctial and solsticial months. Our results also manifest that there is a positive correlation between the intensity of geomagnetic disturbances and the time duration of both the positive phase and negative phase. The durations of both negative phase and positive phase have clear latitudinal, seasonal and magnetic local time (MLT) dependence. In the winter hemisphere, long durations for the positive phase are 8-11 h and 12-14 h during the daytime at middle and high latitudes for 20⩽Ap<40 and Ap⩾40. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 52007402 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Time delay and duration of ionospheric total electron content responses to geomagnetic disturbances. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Liu%2C+J%2E%22">Liu, J.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhao%2C+B%2E%22">Zhao, B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22L%2E+Liu%22">L. Liu</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Annales+Geophysicae+%28ANGEO%29+%2809927689%29%22">Annales Geophysicae (ANGEO) (09927689)</searchLink>. Mar2010, Vol. 28 Issue 3, p795-805. 11p. 6 Graphs. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Ionosphere%22">Ionosphere</searchLink><br />*<searchLink fieldCode="DE" term="%22Geomagnetism%22">Geomagnetism</searchLink><br />*<searchLink fieldCode="DE" term="%22Ionospheric+storms%22">Ionospheric storms</searchLink><br />*<searchLink fieldCode="DE" term="%22Electrons%22">Electrons</searchLink><br />*<searchLink fieldCode="DE" term="%22Latitude%22">Latitude</searchLink><br />*<searchLink fieldCode="DE" term="%22Winter%22">Winter</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22United+States%22">United States</searchLink> – Name: SubjectCompany Label: Company/Entity Group: Su Data: <searchLink fieldCode="DE" term="%22Jet+Propulsion+Laboratory+%28U%2ES%2E%29%22">Jet Propulsion Laboratory (U.S.)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Although positive and negative signatures of ionospheric storms have been reported many times, global characteristics such as the time of occurrence, time delay and duration as well as their relations to the intensity of the ionospheric storms have not received enough attention. The 10 years of global ionosphere maps (GIMs) of total electron content (TEC) retrieved at Jet Propulsion Laboratory (JPL) were used to conduct a statistical study of the time delay of the ionospheric responses to geomagnetic disturbances. Our results show that the time delays between geomagnetic disturbances and TEC responses depend on season, magnetic local time and magnetic latitude. In the summer hemisphere at mid- and high latitudes, the negative storm effects can propagate to the low latitudes at post-midnight to the morningsector with a time delay of 4-7 h. As the earth rotates to the sunlight, negative phase retreats to higher latitudes and starts to extend to the lower latitude toward midnight sector. In the winter hemisphere during the daytime and after sunset at mid- and low latitudes, the negative phase appearance time is delayed from 1-10 h depending on the local time, latitude and storm intensity compared to the same area in the summer hemisphere. The quick response of positive phase can be observed at the auroral area in the night-side of the winter hemisphere. At the low latitudes during the dawn-noon sector, the ionospheric negative phase responses quickly with time delays of 5-7 h in both equinoctial and solsticial months. Our results also manifest that there is a positive correlation between the intensity of geomagnetic disturbances and the time duration of both the positive phase and negative phase. The durations of both negative phase and positive phase have clear latitudinal, seasonal and magnetic local time (MLT) dependence. In the winter hemisphere, long durations for the positive phase are 8-11 h and 12-14 h during the daytime at middle and high latitudes for 20⩽Ap<40 and Ap⩾40. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.5194/angeo-28-795-2010 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 795 Subjects: – SubjectFull: Ionosphere Type: general – SubjectFull: Geomagnetism Type: general – SubjectFull: Ionospheric storms Type: general – SubjectFull: Electrons Type: general – SubjectFull: Latitude Type: general – SubjectFull: Winter Type: general – SubjectFull: United States Type: general – SubjectFull: Jet Propulsion Laboratory (U.S.) Type: general Titles: – TitleFull: Time delay and duration of ionospheric total electron content responses to geomagnetic disturbances. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Liu, J. – PersonEntity: Name: NameFull: Zhao, B. – PersonEntity: Name: NameFull: L. Liu IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 09927689 Numbering: – Type: volume Value: 28 – Type: issue Value: 3 Titles: – TitleFull: Annales Geophysicae (ANGEO) (09927689) Type: main |
| ResultId | 1 |
