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High order spectral analysis of electron plasma oscillations in the electron foreshock
Gurnett, D. A.; Pickett, J. S.; Walker, S. N. +1 more
The electron foreshock is the region in which electrons that have been reflected from the shock propagate back upstream along the magnetic field lines forming electron beams. The process of relaxation of these beams is one of the fundamental topics in plasma physics. It involves numerous nonlinear processes. High order spectral analysis is applied…
Solar radio observations and development of coronal mass ejections
Pick, M.; Maia, D.; Marqué, Ch.
We present in this study a synthesis of results on the initiation and development of CMEs using coordinated observations from SOHO and ground-based instruments. The emphasis is placed on radio spectral and imaging data. One important goal of this study is the identification of radio signatures of CMEs providing information below one solar radius a…
Pile-up on X-ray CCD instruments
Ballet, J.
Pile-up occurs on X-ray CCDs when several photons hit the detector at the same place between two readouts. In that case they are counted as one (or not at all) and their energies are summed. Pile-up thus affects both flux measurements and spectral characterisation of bright sources. Here I extend a previous work on flux loss, and present a simple …
Comparative study of the dust emission of 19P/Borrelly (Deep space 1) and 1P/Halley
Soderblom, L. A.; Thomas, N.; Ho, T. M. +2 more
Images obtained by the Miniature Integrated Camera and Imaging Spectrometer (MICAS) experiment onboard the Deep Space 1 spacecraft which encountered comet 19P/Borrelly on September 22nd 2001 show a dust coma dominated by jets. In particular a major collimated dust jet on the sunward side of the nucleus was observed. Our approach to analyse these f…
The dynamic 3D heliosphere: Implications for and new sources of its energetic particles
McComas, D. J.; Schwadron, N. A.
In recent years, two important aspects of heliospheric physics have emerged: (1) the intrinsic dynamism of the Sun's open magnetic flux and its vast importance for energetic particle propagation and acceleration; and (2) the importance of heliospheric grain populations for the production of energetic particles and anomalous cosmic rays. These new …
The spatial correlation of the non-thermal velocities for O IV and Si IV in the lower transition region
Doschek, G. A.; Mariska, J. T.; Akiyama, S.
We analyze the spatial relationship between non-thermal velocities derived from spectral lines of O IV. λ1401.16 (1.6×105 K) and Si IV λ1402.77 (6.3x10 4 K) in the solar lower transition region. The lines formed at different temperatures are observed simultaneously and at the same locations on the solar disk by the Solar Ultraviolet Mea…
Magnetic cloud and magnetosphere — Ionosphere response to the 6 November 1997 CME
Bochev, A. Z.; -Dimitrova, I. I. A.
In the present work we analyse the magnetic cloud (MC) at 1 AU on 9 November 1997. The appearance of a hotter and dense part (dense filament), with radial extent 10 6 km, immediately behind the frontal part of the MC, is a distinctive feature of the event. The INTERBALL - Aurora] Probe had a chance to observe field-aligned currents in t…
Propagation of CMEs in the interplanetary medium: Numerical and analytical results
Raga, A. C.; Lara, A.; Cantó, J. +2 more
We study the propagation of coronal mass ejections (CMES) from near the Sun to 1 AU by comparing results from two different models: a 1-D, hydrodynamic, single-fluid, numerical model (González-Esparza et al., 2003a) and an analytical model to study the dynamical evolution of supersonic velocity's fluctuations at the base of the solar wind applied …
Coronal mass ejection speeds measured in the solar corona using LASCO C2 and C3 images
Stenborg, G.; Gonzalez, W. D.; Dal Lago, A. +1 more
In this work we present height-time diagrams of 2 halo coronal mass ejections, observed on September 28th, 1997 and June 29th, 1999. The CMEs were observed by the Large Angle and Spectroscopic Coronagraph (LASCO), which observes the solar corona from 2 to 32 solar radii. To obtain these diagrams we divide the LASCO images of a given sequence in an…
Ultraviolet light curves of eclipsing binary stars. I. The catalogue of IUE data
Połubek, Grzegorz
The catalogue contains eclipsing and ellipsoidal variable stars observed by International Ultraviolet Explorer satellite (IUE). As examples we discuss IUE data for Algol (β Persei) and MR Cygni.