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Cluster observations of bounday layer structure and a flux transfer event near the cusp
Balogh, A.; Fazakerley, A. N.; Kistler, L. M. +6 more
On the 25th January 2002 between 10:00 and 12:00 UT, the four Cluster spacecraft passed through the northern high-latitude cusp, the dayside magnetosphere and into the magnetosheath in a linear formation. In the magnetosphere the PEACE electron spectrometers on the four spacecraft all observed a series of transient bursts of magnetosheath-like pla…
The GRB 011211 X-Ray Lines: Toward Resolving the Significance Debate
Ricker, G.; Vanderspek, R.; Ford, P. +4 more
We demonstrate for the GRB 011211 X-ray afterglow lines that the significance estimation methods used by Reeves et al. and Rutledge & Sako are consistent and that the conflicting estimates found by those authors arise from different assumptions in the continuum modeling. If the column density is fixed at the Galactic value as in the Reeves et …
Smart-1: An analysis of flight data
Di Cara, Davina M.; Estublier, Denis
The main purpose of the ESA SMART-1 mission, (Small Mission for Advanced Research and Technology), is to flight-test a new Primary Electric Propulsion sub-System (EPS), a highly efficient and lightweight propulsion sub-System that will eventually be used for long duration deep-space missions, reducing the size and the cost of the propulsion system…
A corrector for spacecraft calculated electron moments
Génot, V.; Fazakerley, A. N.; Schwartz, S. J. +3 more
We present the application of a numerical method to correct electron moments calculated on-board spacecraft from the effects of potential broadening and energy range truncation. Assuming a shape for the natural distribution of the ambient plasma and employing the scalar approximation, the on-board moments can be represented as non-linear integral …
Sources, Transport, and Losses of Energetic Particles During Geomagnetic Storms
Jordanova, Vania K.
We discuss the main source, transport, and loss mechanisms for energetic (∼1-300 keV) particles during geomagnetic storms. The importance of both solar wind and ionospheric sources is shown. Examples for ring current formation and decay from physics-based models using multi-point satellite measurements are given. Both numerical simulations and glo…
Energetic particle signatures of geoeffective coronal mass ejections
Laitinen, T.; Valtonen, E.; Huttunen-Heikinmaa, K.
We have studied statistically associations of moderate and intense geomagnetic storms with coronal mass ejections (CMEs) and energetic particle events. The goal was to identify specific energetic particle signatures, which could be used to improve the predictions of the geoeffectiveness of full and partial halo CMEs. Protons in the range 1-110 MeV…
The recurrent ultra-luminous X-ray transient NGC 253 ULX1
Pietsch, W.; Bauer, M.
We present the results of ROSAT and XMM-Newton observations of the recurrent ultraluminous X-ray source (ULX)
Cluster observation of continuous reconnection at dayside magnetopause in the vicinity of cusp
Balogh, A.; Eastwood, J. P.; Lucek, E. A. +10 more
In this paper, we present a case study of continuous reconnection at the dayside magnetopause observed by the Cluster spacecraft. On 1 April 2003, the four Cluster spacecraft experienced multiple encounters with the Earth's dayside magnetopause under a fairly stable southwestward interplanetary magnetic field (IMF). Accelerated plasma flows, whose…
The Surface Structure of the M-Type Asteroid 21 Lutetia: Spectral and Frequency Analysis
Prokof'eva, V. V.; Bochkov, V. V.; Busarev, V. V.
A preliminary study of the surface of the asteroid 21 Lutetia with ground-based methods is of significant importance, because this object is included into the Rosetta space mission schedule. From August 31 to November 20, 2000, about 50 spectra of Lutetia and the same number of spectra of the solar analog HD10307 (G2V) and regional standards were …
Helioseismic evidence of two solar granulation timescales
Vázquez Ramió, H.; Roca Cortés, T.; Régulo, C.
The signature of two different scales of solar granulation in the power spectrum of disk integrated irradiance time series is presented. The fitted timescales for granulation (τGR1≈ 237~s and τGR2≈ 62~s) are in good agreement with the characteristic lifetimes derived from recent image time series of the Sun's surface (Del Mor…