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排序方式: 共有216条查询结果,搜索用时 15 毫秒
161.
M. K. Reuss E. Keppler M. Fränz M. Witte N. Krupp B. Wilken A. Balogh R. J. Forsyth X. Moussas J. M. Polygiannakis A. D. Kakouris A. Alevizos 《Space Science Reviews》1995,72(1-2):343-346
In November 1992, the Ulysses spacecraft observed a multiple solar particle event and a CME event at 5.2 AU and a heliographic latitude of 20° S which were superimposed to the recurrent corotating interacting region. Distinct particle flux increases caused by these events were observed in all energy channels of the EPAC experiment. The experimental findings are discussed. 相似文献
162.
Helmut Lammer Eric Chassefière Özgür Karatekin Achim Morschhauser Paul B. Niles Olivier Mousis Petra Odert Ute V. Möstl Doris Breuer Véronique Dehant Matthias Grott Hannes Gröller Ernst Hauber Lê Binh San Pham 《Space Science Reviews》2013,174(1-4):113-154
The evolution and escape of the martian atmosphere and the planet’s water inventory can be separated into an early and late evolutionary epoch. The first epoch started from the planet’s origin and lasted ~500 Myr. Because of the high EUV flux of the young Sun and Mars’ low gravity it was accompanied by hydrodynamic blow-off of hydrogen and strong thermal escape rates of dragged heavier species such as O and C atoms. After the main part of the protoatmosphere was lost, impact-related volatiles and mantle outgassing may have resulted in accumulation of a secondary CO2 atmosphere of a few tens to a few hundred mbar around ~4–4.3 Gyr ago. The evolution of the atmospheric surface pressure and water inventory of such a secondary atmosphere during the second epoch which lasted from the end of the Noachian until today was most likely determined by a complex interplay of various nonthermal atmospheric escape processes, impacts, carbonate precipitation, and serpentinization during the Hesperian and Amazonian epochs which led to the present day surface pressure. 相似文献
163.
Global Gravity Field Recovery Using Solely GPS Tracking and Accelerometer Data from Champ 总被引:2,自引:0,他引:2
Reigber C. Balmino G. Schwintzer P. Biancale R. Bode A. Lemoine J.-M. König R. Loyer S. Neumayer H. Marty J.-C. Barthelmes F. Perosanz F. Zhu S. Y. 《Space Science Reviews》2003,108(1-2):55-66
A new long-wavelength global gravity field model, called EIGEN-1, has been derived in a joint German-French effort from orbit
perturbations of the CHAMP satellite, exploiting CHAMP-GPS satellite-to-satellite tracking and on-board accelerometer data
over a three months time span. For the first time it becomes possible to recover the gravity field from one satellite only.
Thanks to CHAMP'S tailored orbit characteristics and dedicated instrumentation, providing continuous tracking and on-orbit
measurements of non-gravitational satellite accelerations, the three months CHAMP-only solution provides the geoid and gravity
with an accuracy of 20 cm and 1 mgal, respectively, at a half wavelength resolution of 550 km, which is already an improvement
by a factor of two compared to any pre-CHAMP satellite-only gravity field model.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
164.
165.
Tilman Spohn Karsten Seiferlin Axel Hagermann Jörg Knollenberg Andrew J. Ball Marek Banaszkiewicz Johannes Benkhoff Stanislaw Gadomski Wojciech Gregorczyk Jerzy Grygorczuk Marek Hlond Günter Kargl Ekkehard Kührt Norbert Kömle Jacek Krasowski Wojciech Marczewski John C. Zarnecki 《Space Science Reviews》2007,128(1-4):339-362
MUPUS, the multi purpose sensor package onboard the Rosetta lander Philae, will measure the energy balance and the physical parameters in the near-surface layers – up to about 30 cm depth- of the
nucleus of Rosetta’s target comet Churyumov-Gerasimenko. Moreover it will monitor changes in these parameters over time as
the comet approaches the sun. Among the parameters studied are the density, the porosity, cohesion, the thermal diffusivity
and conductivity, and temperature. The data should increase our knowledge of how comets work, and how the coma gases form.
The data may also be used to constrain the microstructure of the nucleus material. Changes with time of physical properties
will reveal timescales and possibly the nature of processes that modify the material close to the surface. Thereby, the data
will indicate how pristine cometary matter sampled and analysed by other experiments on Philae really is. 相似文献
166.
Solar Surface Magnetism and Irradiance on Time Scales from Days to the 11-Year Cycle 总被引:1,自引:0,他引:1
V. Domingo I. Ermolli P. Fox C. Fröhlich M. Haberreiter N. Krivova G. Kopp W. Schmutz S. K. Solanki H. C. Spruit Y. Unruh A. Vögler 《Space Science Reviews》2009,145(3-4):337-380
The uninterrupted measurement of the total solar irradiance during the last three solar cycles and an increasing amount of solar spectral irradiance measurements as well as solar imaging observations (magnetograms and photometric data) have stimulated the development of models attributing irradiance variations to solar surface magnetism. Here we review the current status of solar irradiance measurements and modelling efforts based on solar photospheric magnetic fields. Thereby we restrict ourselves to the study of solar variations from days to the solar cycle. Phenomenological models of the solar atmosphere in combination with imaging observations of solar electromagnetic radiation and measurements of the photospheric magnetic field have reached high enough quality to show that a large fraction (at least, about 80%) of the solar irradiance variability can be explained by the radiative effects of the magnetic activity present in the photosphere. Also, significant progress has been made with magnetohydrodynamic simulations of convection that allow us to relate the radiance of the photospheric magnetic structures to the observations. 相似文献
167.
168.
Clinton J. Giardini D. Böse M. Ceylan S. van Driel M. Euchner F. Garcia R. F. Kedar S. Khan A. Stähler S. C. Banerdt B. Lognonne P. Beucler E. Daubar I. Drilleau M. Golombek M. Kawamura T. Knapmeyer M. Knapmeyer-Endrun B. Mimoun D. Mocquet A. Panning M. Perrin C. Teanby N. A. 《Space Science Reviews》2018,214(8):1-51
Space Science Reviews - In recent decades, volcanic and cryovolcanic activity on moons within the Solar System has been recognised as an important source of cosmic dust. Two moons, Jupiter’s... 相似文献
169.
Space Science Reviews - 相似文献
170.