Search Publications
Blob formation and acceleration in the solar wind: role of converging flows and viscosity
Lapenta, G.; Restante, A. L.
The effect of viscosity and of converging flows on the formation of blobs in the slow solar wind is analysed by means of resistive MHD simulations. The regions above coronal streamers where blobs are formed (Sheeley et al., 1997) are simulated using a model previously proposed by Einaudi et al. (1999). The result of our investigation is two-fold. …
Volcanology of Arnus Vallis, Mars
Rampey, Michael L.; Harvey, Ralph P.
Arnus Vallis (AV) is a >300-km-long sinuous, rille located on the northeastern flank of the Syrtis Major volcano on Mars. Observational evidence presented here suggests that AV formed as an open lava channel that was at least partly incised into the pre-existing terrain. The lava source area consists of a sub-circular pit at the southwestern en…
First Orbits for Five Binaries
Cvetković, Z.
In this paper, new orbital elements are given for five binaries. For all of them—Washington Double Star (WDS) 00469+4339 = HDS 102, WDS 02186+4017 = EGG 2Aa, WDS 05542 - 2909 = FIN 382, WDS 06493- 0216 = FIN 322, and WDS 11495 - 4604 = FIN 366—the orbital elements are calculated for the first time. One of the five binaries, HDS 102, was discovered…
Relativistic Outflows in Two Quasars in the Chandra Deep Field South
Wang, J. X.; Zheng, Z. Y.
In this paper we provide new 1 Ms Chandra ACIS spectra of two quasars in the Chandra Deep Field South (CDF-S) which had strong and extremely blueshifted X-ray emission/absorption line features in previous 1 Ms spectra, with outflowing bulk velocity v ~ 0.65-0.84c. In the new 1 Ms spectra, the relativistic blueshifted line feature is solidly confir…
Empirical Reconstruction
de Keyser, Johan
Empirical reconstruction methods attempt to interpret in situ observations of the magnetospheric boundary in terms of time-stationary structures that are convected past the spacecraft. The ever-changing position of the boundary is considered an unknown of the problem. Once the motion of the boundary is found, empirical reconstruction produces spat…
Small-scale flows in SUMER and TRACE high-cadence co-observations
Doyle, J. G.; Madjarska, M. S.
Context: We report on the physical properties of small-scale transient flows observed simultaneously at high cadence with the SUMER spectrometer and the TRACE imager in the plage area of an active region.
Aims: Our major objective is to provide a better understanding of the nature of transient phenomena in the solar atmosphere by using high-ca…
Shrinkage of magnetosphere observed by TC-1 satellite during the high-speed solar wind stream
Reme, H.; Carr, C. M.; Cao, JinBin +6 more
During the interval 06:14-07:30 UT on August 24, 2005, since the Earth's magnetopause was suddenly compressed by the persistent high-speed solar wind stream with the southward component of the interplanetary magnetic field (IMF), the magnetopause moved inward for about 3.1 RE. Meanwhile, TC-1 satellite shifted from northern plasma sheet to the nor…
On the ultraviolet signatures of small scale heating in coronal loops
Young, P. R.; Parenti, S.
Aims: Studying the statistical properties of solar ultraviolet emission lines could provide information about the nature of small scale coronal heating. We expand on previous work to investigate these properties. We study whether the predicted statistical distribution of ion emission line intensities produced by a specified heating function is aff…
In situ thermal conductivity measurements of Titan's lower atmosphere
Lorenz, R. D.; Hagermann, A.; Leese, M. R. +8 more
Thermal conductivity measurements, presented in this paper (Fig. 3), were made during the descent of the Huygens probe through the atmosphere of Titan below the altitude of 30 km. The measurements are broadly consistent with reference values derived from the composition, pressure and temperature profiles of the atmosphere; except in narrow altitud…
Prospects for future enhanced solar energetic particle events and the effects of weaker heliospheric magnetic fields
Kahler, S. W.
Recent work based on nitrate abundances in ice cores has shown that large solar energetic (E > 30 MeV) particle (LSEP) events during the spacecraft era of observations (1960-present) are diminished in comparison with those of some preceding eras and that LSEP events have occurred during low cycles of solar activity. McCracken et al. (2004) have…