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Low energy charged particles in the high latitude heliosphere: Comparing solar maximum and solar minimum
Lanzerotti, L. J.; Gold, R. E.; Maclennan, C. G.
Low energy charged particles in the global (3-D) heliosphere within ~2.3 AU of the Sun are compared during the two fast latitude scans by the Ulysses spacecraft at solar minimum and maximum. This comparison of data taken by the HISCALE instrument illustrates quantitatively the differences in the population of the heliosphere during the only two so…
First results from the IBIS/ISGRI data obtained during the Galactic Plane Scan. II. The Vela region
Goldoni, P.; Rodriguez, J.; Foschini, L. +14 more
We report on INTEGRAL/IBIS observations of the Vela region during a Galactic Plane Scan (hereafter GPS) presenting the IBIS in-flight performances during these operations. Among all the known sources in the field of view we clearly detect 4U 0836-429, Vela X-1, Cen X-3, GX 301-2, 1E 1145.1-6141, and H0918-549 in the 20-40 keV energy range. Only Ve…
Addendum: ``Discovery of a Possible Anomalous X-Ray Pulsar in the Small Magellanic Cloud'' (ApJ, 574, L29 [2002])
Fox, D. W.; Lamb, R. C.; Macomb, D. J. +1 more
In the above-mentioned Letter, two frequencies for this source were reported, 0.125 and 0.184 Hz. These frequencies form an alias pair around the Nyquist frequency of the Chandra ACIS-I instrument. New data for this source from the XMM-Newton satellite taken 189.9 days after the original Chandra observation decisively rule in favor of the lower fr…
A Search for Lyα Emission from the Astrosphere of 40 Eridani A
Zank, Gary P.; Wood, Brian E.; Linsky, Jeffrey L. +1 more
We report the results of Hubble Space Telescope (HST) observations of the nearby (d=5.0 pc) K1 V star 40 Eri A, which we use to search for scattered Lyα emission surrounding the star indicative of the interaction between the stellar wind and the interstellar medium (ISM). Absorption from circumstellar hot H I has previously been detected around ma…
Cassini-VIMS at Jupiter: solar occultation measurements using Io
Sotin, C.; Brown, R. H.; Baines, K. H. +24 more
We report unusual and somewhat unexpected observations of the jovian satellite Io, showing strong methane absorption bands. These observations were made by the Cassini VIMS experiment during the Jupiter flyby of December/January 2000/2001. The explanation is straightforward: Entering or exiting from Jupiter's shadow during an eclipse, Io is illumi…
Modelling the Torques Affecting the Hipparcos Satellite
van Leeuwen, Floor; Fantino, Elena
Reconstructed attitude data for the Hipparcos mission as obtained in the final stages of the data analysis for the published catalogue is used to derive detailed information on the dynamics of the satellite. Most elements of the inertia tensor of the satellite could be calibrated from the observed acceleration data, which are also used to reconstr…
Relationship between decrease of net magnetic flux and solar major events
Liu, Y.; Tian, L. R.
Using the full disk magnetograms taken by SOHO/MDI, we studied the evolution of magnetic fluxes in the line-of-sight for twelve solar active regions in the 23rd cycle, which produced strong solar activities. It is measured that the fluxes of these regions were appreciably imbalanced when they moved past the central meridian, where reliable measure…
The obscured QSO 1SAX J1218.9+2958
Page, M. J.; Ramsay, G.; Loaring, N. S.
We present results from XMM-Newton observations of the obscured quasi-stellar object 1SAX J1218.9+2958. We find that the previously reported optical and soft X-ray counterpart positions are incorrect. However, we confirm the spectroscopic redshift of 0.176. The optical counterpart has a K magnitude of 13.5 and an R-K colour of 5.0 and is therefore…
The analogy between sunquakes and water waves
Podesta, J. J.
To investigate the seismic waves generated at the surface of the convection zone by a sunquake, the solar convection zone is modeled as an incompressible fluid layer of finite depth which is excited by a pressure pulse just above the solar surface. Solutions for the surface displacement ζ as a function of time are obtained by solving the linearize…
Anomalously bright UV lines of Fe II as a probe of gas condensations in the vicinity of hot stars
Johansson, S.; Letokhov, V. S.
Two UV lines of Fe II at 2507/2509 Å are extremely bright in spatially resolved HST/STIS spectra of dense gas condensations (the so called Weigelt blobs) close to the central star of η Carinae. The lines also appear unresolved in HST/FOS spectra of the star AE And. Under normal conditions the lines should hardly be observable. Based on recent stud…