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Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp
Orsini, S.; Pitout, F.; Balogh, A. +56 more
On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside magnetopause over Green-land between 13:00 and 14:00 UT. During that interval, a sudden reorganisation of the high-latitude dayside convection pattern occurre…
First Cluster results of the magnetic field structure of the mid- and high-altitude cusps
Balogh, A.; Dunlop, M. W.; Cargill, P. J. +1 more
Magnetic field measurements from the four Cluster spacecraft from the mid- and high-altitude cusp are presented. Cluster underwent two encounters with the mid-altitude cusp during its commissioning phase (24 August 2000). Evidence for field-aligned currents (FACs) was seen in the data from all three operating spacecraft from northern and southern …
Ground-based and satellite observations of high-latitude auroral activity in the dusk sector of the auroral oval
Janhunen, P.; Orsini, S.; André, M. +18 more
On 7 December 2000, during 13:30-15:30 UT the MIRACLE all-sky camera at Ny Ålesund observed auroras at high-latitudes (MLAT ~ 76) simultaneously when the Cluster spacecraft were skimming the magnetopause in the same MLT sector (at ~ 16:00-18:00 MLT). The location of the auroras (near the ionospheric convection reversal boundary) and the clear corr…
Four point measurements of electrons using PEACE in the high-altitude cusp
Coates, A. J.; Wilson, R. J.; Owen, C. J. +8 more
We present examples of electron measurements from the PEACE instruments on the Cluster spacecraft in the high-latitude, high-altitude region of the Earth's magnetosphere. Using electron density and energy spectra measurements, we examine two cases where the orbit of the Cluster tetrahedron is outbound over the northern hemisphere, in the afternoon…
Preliminary two-point observations of the mid-altitude cusp by Cluster PEACE and FGM
Coates, A. J.; Wilson, R. J.; Fazakerley, A. N. +8 more
On 1 October 2000, Cluster spacecraft Samba (Cluster 3) and Tango (Cluster 4) made an outbound crossing of the northern mid-altitude (4.7 RE) cusp region, moving roughly parallel to the noon meridian. We present preliminary observations from this interval made by the PEACE and FGM instruments. The interplanetary magnetic field at the magnetopause …
Space science and exploration in the 21st century
Bonnet, R. M.
Available from http://www.copernicus.org/EGU/annales/19/1201.htm;
Probing the magnetic topology of coronal mass ejections by means of Ulysses/HI-SCALE energetic particle observations
Sarris, E. T.; Malandraki, O.; Trochoutsos, P.
In this work, solar flare energetic particle fluxes (Ee geq 42 keV) observed by the HI-SCALE instrument onboard Ulysses, a spacecraft that is probing the heliosphere in 3-D, are utilized as diagnostics of the large-scale structure and topology of the interplanetary magnetic field (IMF) embedded within two well-identified interplanetary coronal mas…
ERNE observations of energetic particles associated with Earth-directed coronal mass ejections in April and May, 1997
Anttila, A.; Sahla, T.
Two Earth-directed coronal mass ejections (CMEs), which were most effective in energetic (~1-50 MeV) particle acceleration during the first 18 months since the Solar and Heliospheric Observatory (SOHO) launch, occurred on April 7 and May 12, 1997. In the analysis of these events we have deconvoluted the injection spectrum of energetic protons by u…
Detection of zero anisotropy at 5.2 AU during the November 1998 solar particle event: Ulysses Anisotropy Telescopes observations
Balogh, A.; Dalla, S.
For the first time during the mission, the Anisotropy Telescopes instrument on board the Ulysses spacecraft measured constant zero anisotropy of protons in the 1.3-2.2 MeV energy range, for a period lasting more than three days. This measurement was made during the energetic particle event taking place at Ulysses between 25 November and 15 Decembe…
A mode filter for plasma waves in the Hall-MHD approximation
Glassmeier, K. -H.; Motschmann, U.; Vocks, C.
A filter method is presented which allows a qualitative and quantitative identification of wave modes observed with plasma experiments on satellites. Hitherto existing mode filters are based on the MHD theory and thus they are restricted to low frequencies well below the ion cyclotron frequency. The present method is generalized to cover wave mode…