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Surprising Sun: A New Step Towards a Complete Picture?

García, R. A.; Turck-Chièze, S.; Piau, L. +5 more

Important revisions of the solar model ingredients have appeared recently. We first show that the updated CNO composition suppresses the anomalous position of the Sun in the known galactic enrichment. The following law, He/H=0.075+44.6 O/H in number fraction, is now compatible with all the indicators. We then suggest some directions of investigati…

Theory and Observations of Slow-Mode Solitons in Space Plasmas

Stasiewicz, K.

A generalized model for one-dimensional magnetosonic structures of large amplitude in space plasmas is presented. The model is verified with multipoint measurements on Cluster satellites in the magnetosheath and the boundary layer under conditions of plasma beta (plasma/magnetic pressure) between 0.1 10. We demonstrate good agreement between the m…

Slow Magnetosonic Solitons Detected by the Cluster Spacecraft

Lavraud, B.; Buchert, S.; Gustafsson, G. +4 more

Experimental evidence is provided for the existence of slow-mode magnetosonic solitons in the col­lisionless plasma at the magnetopause boundary layer. The solitons were detected by the fleet of Cluster spacecraft at the dusk flank of the magnetosphere as magnetic field depressions (up to 85%) accom­panied with enhancement of the plasma density an…

Density-Transition Scale at Quasiperpendicular Collisionless Shocks

Bale, S. D.; Horbury, T. S.; Mozer, F. S.

Measurements of a spacecraft floating potential, on the four Cluster spacecraft, are used as a proxy for electron plasma density to study, for the first time, the macroscopic density transition scale at 98crossings of the quasiperpendicular terrestrial bow shock. A timing analysis gives shock speeds and normals; the shock speed is used to convert …

Determination of Hyperfine-Induced Transition Rates from Observations of a Planetary Nebula

Judge, Philip G.; Proffitt, Charles R.; Brage, Tomas

Observations of the planetary nebula NGC3918 made with the STIS instrument on the Hubble Space Telescope reveal the first unambiguous detection of a hyperfine-induced transition 2s2p

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Comment on ``Indication, from Pioneer 10/11, Galileo, and Ulysses Data, of an Apparent Anomalous, Weak, Long-Range Acceleration''

Katz, J. I.

A Comment on the Letter by John D. Anderson et al., Phys. Rev. Lett. 81, 2858 (1998). The authors of the Letter offer a Reply.

Indication, from Pioneer 10/11, Galileo, and Ulysses Data, of an Apparent Anomalous, Weak, Long-Range Acceleration

Anderson, John D.; Nieto, Michael Martin; Turyshev, Slava G. +3 more

Radio metric data from the Pioneer 10/11, Galileo, and Ulysses spacecraft indicate an apparent anomalous, constant, acceleration acting on the spacecraft with a magnitude ~8.5×10^-8 cm/s², directed towards the Sun. Two independent codes and physical strategies have been used to analyze the data. A number of potential causes ha…

Reexamination of evidence for a radiatively decaying neutrino

Murthy, J.; Henry, R. C.

Nonstandard electroweak models permitting relatively rapid neutrino decay, with emission of ultraviolet photons, stimulate new interest in astronomical methods of detection of the emitted photons. We do not support the detection of a step in the cosmic background spectrum that has been reported recently. New and more sensitive measurements are urg…