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Energetic Particles and Coronal Mass Ejections: a Case Study From ace and Ulysses
Simnett, G. M.
In 2001 the Ulysses spacecraft crossed the ecliptic plane near perihelion. The heliographic longitude with respect to the Earth was within ± 20° of the west solar limb while it was ± 15° of the ecliptic plane, which meant that coronal mass ejections seen off the solar west limb were likely to pass over Ulysses. On 10 May the largest > 38 keV el…
Cusp structures: combining multi-spacecraft observations with ground-based observations
Escoubet, C. P.; Dandouras, I.; Klecker, B. +16 more
Recent simultaneous observations of cusp structures with Polar, FAST and Interball revealed remarkably similar features at spacecraft crossing the cusp. Such stable cusp structures could be observed up to several hours only during stable solar wind conditions. Their similarities led to the conclusion that for such conditions large-scale cusp struc…
High-resolution radio structure and optical kinematics of NGC 7027
Redman, M. P.; Bryce, M.; Thomasson, P. +2 more
We present the results of the highest-resolution 18-cm (L-band) radio continuum and optical kinematic studies to date of the young planetary nebula (PN), NGC 7027. We discuss the radio image of NGC 7027 made from combined data from the Multi-Element Radio-Linked Interferometer Network and the Very Large Array. This image is used to derive the dist…
Metric observations of transient, quasi-periodic radio emission from the solar corona in association with a ``halo'' CME and an ``EIT wave'' event
Ramesh, R.; Kathiravan, C.; Ebenezer, E. +1 more
We present metric radio observations of quasi-periodic emission from the solar corona in close association with a ``halo'' CME and an ``EIT wave'' phenomenon. The radio event lasted for about 60 s. Its mean periodicity was ~8.8 s. The estimated Alfvén speed in the corona was 1034 km s-1. The derived height of the source region of the ob…
Dynamics of Blinkers
Harrison, R. A.; Parnell, C. E.; Pike, C. D. +1 more
The relative Doppler and non-thermal velocities of quiet-Sun and active-region blinkers identified in O v with CDS are calculated. Relative velocities for the corresponding chromospheric plasma below are also determined using the He i line. O v blinkers and the chromosphere directly below, have a preference to be more red-shifted than the normal t…
Observations of oscillations in the transition region above sunspots
Curdt, W.; Staude, J.; Rendtel, J.
Observations during two campaigns of the SUMER spectrograph and the EIT imager onboard SoHO were used to analyse oscillations in bright sunspot plumes. We report variations of both intensity and velocity seen in EUV emission lines originating in the sunspot upper chromosphere and the transition region. The wavelet analysis reveals rapidly changing…
Electric field measurements in the inner magnetosphere by Cluster EDI
Baumjohann, W.; Torbert, R. B.; Matsui, H. +4 more
We report electric field measurements in the inner magnetosphere from the Electron Drift Instrument (EDI) on Cluster at distances of 4 < L < 10. The data used in this study span more than 1 year so that all local times are covered. Both components of the electric field perpendicular to the ambient magnetic field are mapped into the equatoria…
SPI/INTEGRAL observation of the Cygnus region
Boggs, S.; von Kienlin, A.; Bouchet, L. +22 more
We present the analysis of the first observations of the Cygnus region by the SPI spectrometer onboard the Integral Gamma Ray Observatory, encompassing ~600 ks of data. Three sources namely Cyg X-1, Cyg X-3 and EXO 2030+375 were clearly detected. Our data illustrate the temporal variability of Cyg X-1 in the energy range from 20 keV to 300 keV. Th…
Mid-Infrared Imaging of the Protostellar Binary L1448N IRS 3(A,B)
Ciardi, David R.; Williams, Jonathan P.; Telesco, Charles M. +4 more
Mid-infrared (10-25 µm) imaging of the protostellar binary system L1448N IRS 3(A,B) is presented. Only one source, IRS 3(A), was detected at mid-infrared wavelengths-all of the mid-infrared emission from IRS 3(A,B) emanates from IRS 3(A). The mid-infrared luminosity of IRS 3(A) is Lmidir=1.3[d/(300pc)]2Lsolar…
Near-infrared and ISOCAM observations of the Chamaeleon II dark cloud
Olofsson, G.; Gómez, M.; Persi, P. +1 more
An infrared study including ISOCAM images at 6.75 and 14.3 mu m of a large portion (28 arcmin x 26 arcmin) of the Chamaeleon II dark cloud and sub-arcsec resolution JHKs images of the central (4.9 arcmin x 4.9 arcmin) area is presented. Combining the ISOCAM observations with J and Ks photometry obtained with DENIS, we have fo…