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Photometric Confirmation of MACHO Large Magellanic Cloud Microlensing Events
Bennett, David P.; Becker, Andrew C.; Tomaney, Austin
We present previously unpublished photometry of three Large Magellanic Cloud (LMC) microlensing events and show that the new photometry confirms the microlensing interpretation of these events. These events were discovered by the MACHO Project alert system and were also recovered by the analysis of the 5.7 yr MACHO data set. This new photometry pr…
Poloidal ULF oscillations in the dayside magnetosphere: a Cluster study
Glassmeier, K. -H.; Blomberg, L. G.; Eriksson, P. T. I. +1 more
Three ULF wave events, all occurring in the dayside magnetopshere during magnetically quiet times, are studied using the Cluster satellites. The multi-point measurements obtained from Cluster are used to determine the azimuthal wave number for the events by means of the phase shift and the azimuthal separation between the satellites. Also, the pol…
The widths of vacuum-ultraviolet spectral lines in the equatorial solar corona observed with CDS and SUMER
Dwivedi, B. N.; Harrison, R. A.; Wilhelm, K. +3 more
Observations of the solar equatorial corona between heights of 36 Mm and 184 Mm above the limb obtained by the SOHO spectrometers CDS and SUMER in December 2003 are presented and discussed with special emphasis on the widths of the spectral lines Mg x at 62.50 nm, Al xi at 55.00 nm and 56.82 nm, Ca x at 55.78 nm, and Si xi at 58.09 nm. SUMER obser…
In situ observations of magnetic field fluctuations
Balogh, André; Erdős, Géza
It is well known that the irregularities of the magnetic field are intimately related to the motion of charged particles. Although transport theories need the spatial and time variations of the magnetic field as input, in situ observations are very limited. Ulysses observations have provided a major step forward by entering the unexplored high lat…
A Revised Geometry for the Magnetic Wind of θ1 Orionis C
Smith, Myron A.; Fullerton, Alex W.
The star θ1 Orionis C (O6-7 V) is often cited as a hot analog of Bp variables, because its optical and UV line and X-ray continuum fluxes modulate over the magnetic/rotational period. In this circumstance, one expects emission and absorption components of the UV resonance lines to vary as a flattened magnetosphere corotates with the sta…
Formation and Evolution of Titan's Atmosphere
Coustenis, Athena
The origin and evolution of Titan’s enigmatic atmosphere is reviewed. Starting with the present-day volatile inventory, the question of what was the original composition on Titan and how a satellite of similar size to other Galilean moons managed to acquire and hold on to the required material is discussed. In particular the possible sources and s…
Ultraviolet Hubble Space Telescope Observations of the Jet in M87
Zepf, Stephen E.; Waters, Christopher Z.
We present new ultraviolet photometry of the jet in M87 obtained from Hubble Space Telescope (HST) WFPC2 imaging. We combine these ultraviolet data with previously published photometry for the knots of the jet in radio, optical, and X-ray and fit three theoretical synchrotron models to the full data set. The synchrotron models consistently overpre…
The disrupted molecular envelope of Frosty Leo
Sahai, R.; Sánchez Contreras, C.; Alcolea, J. +2 more
We present maps of CO emission in the protoplanetary nebula Frosty Leo. Observations of the rotational transitions 12CO J=2{-}1 and 1 0 have been obtained with the IRAM interferometer and the OVRO array. The molecular envelope of Frosty Leo is found to be complex and compact; most of the gas extends ⪉6´´ and shows a structure that is ve…
The Martian atmosphere above great volcanoes: Early planetary Fourier spectrometer observations
Grassi, D.; Ignatiev, N. I.; Zasova, L. V. +4 more
This work reports the first observations of the Martian atmosphere returned by the planetary Fourier spectrometer (PFS) on board of Mars express (MEX) satellite in the vicinity of the greatest volcanic domes of the planet. Two of the early MEX orbits have already covered the region of Olympus Mons and Ascraeus Mons. These measurements are very sim…
Helium Abundance in High-Temperature Solar Flare Plasmas
Landi, E.; Feldman, U.; Laming, J. M.
In the present work we use emission from dense plasmas late in the decay phase of flares, while the plasmas are still hot [(2-4)×106 K], to determine the absolute helium abundance in flaring solar corona. To achieve this, we make use of intensity ratios of H I and He II lines and of intensity ratios between the He II lines and the brems…