Search Publications
Isotopic Composition of the Solar Wind Inferred from In-Situ Spacecraft Measurements
Hilchenbach, M.; Kallenbach, R.; Bamert, K.
The Sun is the largest reservoir of matter in the solar system, which formed 4.6 Gyr ago from the protosolar nebula. Data from space missions and theoretical models indicate that the solar wind carries a nearly unfractionated sample of heavy isotopes at energies of about 1 keV/amu from the Sun into interplanetary space. In anticipation of results …
Solar wind structure suggested by bimodal correlations of solar wind speed and density between the spacecraft SOHO and Wind
Coplan, M. A.; Ogilvie, K. W.; Roberts, D. A. +1 more
We calculate the cross-spacecraft maximum lagged-cross-correlation coefficients for 2-hour intervals of solar wind speed and density measurements made by the plasma instruments on the Solar and Heliospheric Observatory (SOHO) and Wind spacecraft over the period from 1996, the minimum of solar cycle 23, through the end of 2005. During this period, …
Prelude to THEMIS tail conjunction study
Kistler, L. M.; Dunlop, M. W.; Rème, H. +8 more
A close conjunction of several satellites (LANL, GOES, Polar, Geotail, and Cluster) distributed from the geostationary altitude to about 16 RE downstream in the tail occurred during substorm activity as indicated by global auroral imaging and ground-based magnetometer data. This constellation of satellites resembles what is planned for …
Determination of Sulfur Abundance in the Solar Wind
Wurz, P.; Bochsler, P.; Ipavich, F. M. +3 more
Solar chemical abundances are determined by comparing solar photospheric spectra with synthetic ones obtained for different sets of abundances and physical conditions. Although such inferred results are reliable, they are model dependent. Therefore, one compares them with the values for the local interstellar medium (LISM). The argument is that th…
XMM-Newton observations of the Small Magellanic Cloud: the 280 s Be/X-ray binary pulsar AX J0058-7203 in outburst
Pietsch, W.; Haberl, F.
Context: The Be/X-ray binary pulsar AX J0058-720, discovered by ASCA, was in the field of view of the EPIC instruments during five XMM-Newton observations in the direction of the Small Magellanic Cloud (SMC).
Aims: We used the EPIC data of the X-ray pulsar in order to investigate its long-term temporal and spectral behaviour between 2000 and 2…
Discovery of inward moving magnetic enhancements in sunspot penumbrae
Woch, J.; Solanki, S. K.; Zhang, J.
Context: Sunspot penumbrae show a fine structure in continuum intensity which displays considerable dynamics. The magnetic field, in contrast, although also highly structured, has been shown to be relatively static in earlier studies.
Aims: We report on the discovery of inward moving magnetic enhancements in the penumbrae of two regular sunspo…
RETRACTED ARTICLE: X-ray observations of PSR B0355+54 and its pulsar wind nebula
Cropper, Mark; Zane, Silvia; Vestrand, W. Thomas +3 more
We present X-ray data of the middle-aged radio pulsar PSR B0355+54. The XMM-Newton and Chandra observations show not only emission from the pulsar itself, but also compact diffuse emission extending ∼50″ in the opposite direction to the pulsar's proper motion. Our analysis also indicates the presence of fainter diffuse emission extending ∼5' from …
Rest-Frame Ultraviolet to Near-Infrared Observations of an Interacting Lyman Break Galaxy at z=4.42
Shapley, Alice E.; Hernquist, Lars; Fazio, Giovanni G. +11 more
We present the rest-frame ultraviolet through near-infrared spectral energy distribution for an interacting Lyman break galaxy at a redshift z=4.42, the highest redshift merging system known with clearly resolved tidal features. The two objects in this system, HDF-G4 and its previously unidentified companion, are both B435-band dropouts…
Modeled variations of the reconnection electric field at the dayside magnetopause during continued flux transfer event activity
Farrugia, C. J.; Penz, T.; Semenov, V. S. +5 more
Three periods of repeated flux transfer event (FTE) observations made by the Cluster satellites are investigated by a novel method for extracting from the observations the reconnection electric field Erec. On 21 January 2001, a series of FTEs is observed at the poleward edge of the cusp around 15 magnetic local time (MLT). Another serie…
A multi-wavelength study of the IRAS Deep Survey galaxy sample. II. The far-IR properties
Mazzei, P.; Bettoni, D.; Della Valle, A.
Context: The luminosity function (LF) is a basic tool in the study of galaxy evolution since it constrains galaxy formation models. The earliest LF estimates in the IR and far-IR spectral ranges seem to suggest strong evolution. Deeper samples are needed to confirm these predictions. We have a useful IR data set, which provides a direct link betwe…