| 1. |
- Boralv, E, et al.
(author)
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The dawn and dusk electrojet response to substorm onset
- 2000
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In: ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES. - : SPRINGER-VERLAG. - 0992-7689. ; 18:9, s. 1097-1107
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Journal article (peer-reviewed)abstract
- We have investigated the time delay between substorm onset and related reactions in the dawn and dusk ionospheric electrojets, clearly separated from the nightside located substorm current wedge by several hours in MLT. We looked for substorm onsets occur
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| 2. |
- Karlsson, SBP, et al.
(author)
-
Solar wind control of magnetospheric energy content: Substorm quenching and multiple onsets
- 2000
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In: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. - : AMER GEOPHYSICAL UNION. - 0148-0227. ; 105:A3, s. 5335-5356
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Journal article (peer-reviewed)abstract
- In this paper we report coordinated multispacecraft and ground-based observations of a double substorm onset close to Scandinavia on November 17, 1996. The Wind and the Geotail spacecraft, which were located in the solar wind and the subsolar magnetosheat
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| 3. |
- KAURISTIE, K, et al.
(author)
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ANALYSIS OF THE SUBSTORM TRIGGER PHASE USING MULTIPLE GROUND-BASED INSTRUMENTATION
- 1995
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In: GEOPHYSICAL RESEARCH LETTERS. - : AMER GEOPHYSICAL UNION. - 0094-8276. ; 22:15, s. 2065-2068
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Journal article (other academic/artistic)abstract
- During the substorm trigger phase, i.e. during the last few minutes before the onset, the slowly and linearly developing growth phase features strengthen exponentially. Often the enhanced auroral activity fades abruptly during a couple of minutes just pri
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| 4. |
- Kauristie, K, et al.
(author)
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Auroral precipitation fading before and at substorm onset: ionospheric and geostationary signatures
- 1997
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In: ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES. - : SPRINGER VERLAG. - 0992-7689. ; 15:8, s. 967-983
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Journal article (other academic/artistic)abstract
- Rapid fading of auroral activity a few minutes before substorm breakup has earlier been analyzed in case-studies. Here we report on a study in which all-sky camera (ASC) and magnetic data over 3 years were examined to find breakups that were accompanied b
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| 5. |
- Kauristie, K, et al.
(author)
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What can we tell about global auroral electrojet activity from a single meridional magnetometer chain?
- 1996
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In: ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES. - : SPRINGER VERLAG. - 0992-7689. ; 14:11, s. 1177-1185
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Journal article (other academic/artistic)abstract
- The AE indices are generally used for monitoring the level of magnetic activity in the auroral oval region. In some cases, however, the oval is either so expanded or contracted that the latitudinal coverage of the AE magnetometer chain is not adequate. Th
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| 6. |
- LOCKWOOD, M, et al.
(author)
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OPPORTUNITIES FOR MAGNETOSPHERIC RESEARCH USING EISCAT/ESR AND CLUSTER
- 1995
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In: JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY. - : TERRA SCIENTIFIC PUBL CO. - 0022-1392. ; 47:8, s. 699-719
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Journal article (other academic/artistic)abstract
- The four Cluster spacecraft offer a unique opportunity to study structure and dynamics in the magnetosphere and we discuss four general ways in which ground-based remote-sensing observations of the ionosphere can be used to support the in-situ measurement
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| 7. |
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| 8. |
- Olsson, A, et al.
(author)
-
Particle precipitation in auroral breakups and westward traveling surges
- 1996
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In: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. - : AMER GEOPHYSICAL UNION. - 0148-0227. ; 101:A11, s. 24661-24673
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Journal article (other academic/artistic)abstract
- We have used data from the European Incoherent Scatter (EISCAT) facility to determine the characteristics of particle precipitation before and within auroral breakups and westward traveling surges. The EISCAT data of electron density versus altitude were
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| 9. |
- Opgenoorth, HJ
(author)
-
Ground-based supporting programmes for the IASTP
- 1997
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In: RESULTS OF THE IASTP PROGRAM. - : PERGAMON PRESS LTD. - 0273-1177. ; 20:4-5, s. 609-620
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Journal article (other academic/artistic)abstract
- During the coming years there will be an unprecedented opportunity to study structure and dynamics of the magnetosphere. A fleet of specialised spacecraft will very much increase our possibilities to simultaneously monitor various magnetospheric regions.
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| 10. |
- Opgenoorth, HJ, et al.
(author)
-
Opportunities for magnetospheric research with coordinated cluster and ground-based observations
- 1997
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In: SPACE SCIENCE REVIEWS. - : KLUWER ACADEMIC PUBL. - 0038-6308. ; 79:1-2, s. 599-637
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Journal article (other academic/artistic)abstract
- ESA's first multi-satellite mission Cluster is unique in its concept of 4 satellites orbiting in controlled formations. This will give an unprecedented opportunity to study structure and dynamics of the magnetosphere. In this paper we discuss ways in whic
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| 11. |
- PELLINEN, RJ, et al.
(author)
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THE TRIGGER PHASE OF MAGNETOSPHERIC SUBSTORMS
- 1994
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In: GEOMAGNETIZM I AERONOMIYA. - : MEZHDUNARODNAYA KNIGA. - 0016-7940. ; 34:6, s. 1-8
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Journal article (other academic/artistic)abstract
- The last few minutes of the substorm growth phase before the auroral breakup show features distinct both from the gradual growth phase development and from the rapidly evolving expansion phase. During this time the optical auroras fade, energetic particle
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| 12. |
- Persson, M. A. L., et al.
(author)
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Near-Earth substorm onset - a coordinated study
- 1994
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In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 21:17, s. 1875-1878
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Journal article (peer-reviewed)abstract
- We present simultaneous satellite and ground-based measurements of a substorm. Throughout the initial substorm expansion, southward drifting arcs are observed poleward of the expanding substorm aurora, indicating two independent systems of particle precipitation. Freja passes the brightening onset arc in the topside ionosphere near the moment of the substorm onset, observing an Alfven wave, field aligned current and oxygen ion outflow. The substorm onset occurs at low magnetospheric L-shells, near the poleward edge of the region of trapped particles. The location and time for the substorm injection are confirmed by geostationary spacecraft together with magnetometers, all-sky cameras and radar on the ground. We believe that the substorm onset may be triggered by modification of the oxygen content of the inner magnetosphere during the growth-phase caused by ionospheric ion outflow.
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| 13. |
- Pulkkinen, TI, et al.
(author)
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Two substorm intensifications compared: Onset, expansion, and global consequences
- 1998
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In: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. - : AMER GEOPHYSICAL UNION. ; 103:A1, s. 15-27
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Journal article (other academic/artistic)abstract
- We present observations of two sequential substorm onsets on May 15, 1996. The first event occurred during persistently negative IMF B-Z, whereas the second expansion followed a northward turning of the interplanetary magnetic field (IMF). While the first
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| 14. |
- Wild, JA, et al.
(author)
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Multi-instrument observations of the electric and magnetic field structure of omega bands
- 2000
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In: ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES. - : SPRINGER VERLAG. - 0992-7689. ; 18:1, s. 99-110 Language: English
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Journal article (peer-reviewed)abstract
- High time resolution data from the CUTLASS Finland radar during the interval 01:30-03:30 UT on 11 May, 1998, are employed to characterise the ionospheric electric field due to a series of omega bands extending similar to 5 degrees in latitude at a resolut
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