Magnetospheric Field Line Resonances: A Comparative Planetology Approach     

Karl-Heinz Glassmeier  Carsten Othmer  Rüdiger Cramm  Martin Stellmacher  Mark Engebretson 《Surveys in Geophysics》1999,20(1):61-109

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A detailed magnetic and mineralogical study of self-reversed dacitic pumices from the 1991 Pinatubo eruption (Philippines)     

M. Bina  J. C. Tanguy  V. Hoffmann  M. Prévot  E. L. Listanco  R. Keller  K. Th. Fehr  A. T. Goguitchaïchvili  & R. S. Punongbayan 《Geophysical Journal International》1999,138(1):159-178

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S.R. Majewski (ed.): Galaxy Evolution: The Milky Way Perspective. Astronomical Society of the Pacific 1993, ASP Conference Series Vol. 49, 256 S., Preis: 55.-US-Dollar. ISBN 0-937707-68-6     

Karl-Heinz Schmidt 《Astronomische Nachrichten》1995,316(1):66-67

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The Hoher List observations of the occultation of 28 Sagittarii by Titan     

M. Hoffmann  E. H. Geyer 《Earth, Moon, and Planets》1991,52(1):83-86

Observations of the occultation of 28 Sgr by Titan are presented. Apparently being located close to the central line of the occultation track, a double peaked central flash was observed. Some characteristic times of the phenomenon are given.  相似文献   

Causes of sinks near Tucson, Arizona, USA     

John P. Hoffmann  Donald R. Pool  A. D. Konieczki  Michael C. Carpenter 《Hydrogeology Journal》1998,6(3):349-364

 Land subsidence in the form of sinks has occurred on and near farmlands near Tucson, Pima County, Arizona, USA. The sinks occur in alluvial deposits along the flood plain of the Santa Cruz River, and have made farmlands dangerous and unsuitable for farming. More than 1700 sinks are confined to the flood plain of the Santa Cruz River and are grouped along two north-northwestward-trending bands that are approximately parallel to the river and other flood-plain drainages. An estimated 17,000 m³ of sediment have been removed in the formation of the sinks. Thirteen trenches were dug to depths of 4–6 m to characterize near-surface sediments in sink and nonsink areas. Sediments below about 2 m included a large percentage of dispersive clays in sink areas. Sediments in nonsink areas contain a large component of medium- to coarse-grained, moderately to well sorted sand that probably fills a paleochannel. Electromagnetic surveys support the association of silts and clays in sink areas that are highly electrically conductive relative to sand in nonsink areas. Sinks probably are caused by the near-surface process of subsurface erosion of dispersive sediments along pre-existing cracks in predominantly silt and clay sediments. The pre-existing cracks probably result from desiccation or tension that developed during periods of water-table decline and channel incision during the past 100 years or in earlier periods. Submitted, April 1997 · Revised, November 1997 · Accepted, April 1998  相似文献   

Marine Protected Areas as a tool for fishery management and ecosystem conservation: an Introduction     

Hoffmann  Erik; Perez-Ruzafa  Angel 《ICES Journal of Marine Science》2009,66(1):1-5

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Ground‐based thermal imagery as a simple,practical tool for mapping saturated area connectivity and dynamics     

Laurent Pfister  Jeffrey J. McDonnell  Christophe Hissler  Lucien Hoffmann 《水文研究》2010,24(21):3123-3132

The hillslope‐riparian‐stream system is a key functional unit of catchments, yet very difficult to measure and monitor due to its tremendous complexity and high spatio‐temporal variability. Here, we present a simple and practical tool for imaging directly these hillslope‐riparian‐area connections. We used a FLIR b50 infrared camera to produce thermal images at the scale of 140 × 140 pixels over the spectral range 7·5–13 µm. Our IR imaging technique is sensitive to the upper 0·1 mm of the water column. Images were obtained from a constant position on the right bank of the Weierbach catchment in Luxembourg, at an incidence angle of approximately 45° over a 5‐week period. The study site measured 5 × 3 m. Our results show that ground‐based IR imagery can discriminate between areas with snow cover, snow melt, soil seepage, and stream water. More importantly, it can detect when and where variably saturated areas are active and when connectivity exists between the hillslope–riparian–stream system. Our proof of concept suggests that this is a simple, inexpensive technology for sequential mapping and characterisation of surface saturated areas and a useful complement to conventional tracer techniques. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Physical oceanography,a mathematical introduction with MATLAB,by Reza Malek-Madani     

Norbert Hoffmann 《地球物理与天体物理流体动力学》2013,107(3):378-379

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Drowned carbonate platforms in the Bismarck Sea,Papua New Guinea     

Gary Hoffmann  Eli Silver  Simon Day  Neal Driscoll  Bruce Appelgate 《Marine Geophysical Researches》2009,30(4):229-236

Extinct volcanic islands in the Bismarck volcanic arc are fringed by well-developed coral reefs. Drowned platforms offshore from these islands provide evidence for subsidence in the central section of the arc, north of the Finisterre Terrane–Australia collision. Bathymetric and backscatter data collected onboard the R/V Kilo Moana in 2004 reveal regularly spaced (~200 m interval) drowned platforms at depths as much as 1,100 m below sea level. However, the adjacent mainland coast has well documented raised terraces indicating long-term uplift. Local subsidence may be due to cessation of magmatic activity and cooling, flexural loading by the uplifting Finisterre Range, loading by nearby active volcanic islands, and/or sediment loading on the seafloor north of the Finisterre Range. We present some simple models in order to test whether flexural loading can account for local subsidence. We find that volcanic and sedimentary loading can explain the inferred relative subsidence.  相似文献   

Magnetic field fossilization and tail reconfiguration in Titan's plasma environment during a magnetopause passage: 3D adaptive hybrid code simulations     

Joachim Müller  Sven Simon  Karl-Heinz Glassmeier  Joachim Saur  Gavin J. Pringle 《Planetary and Space Science》2010,58(12):1526-1546

We present a hybrid simulation study (kinetic ions, fluid electrons) of Titan's plasma interaction during an excursion of this moon from Saturn's magnetosphere into its magnetosheath, as observed for the first time during Cassini's T32 flyby on 13 June 2007. In contrast to earlier simulations of Titan's plasma environment under non-stationary upstream conditions, our model considers a difference in the flow directions of magnetospheric and magnetosheath plasma. Two complementary scenarios are investigated, with the flow directions of the impinging magnetospheric/magnetosheath plasmas being (A) antiparallel and (B) parallel. In both cases, our simulations show that due to the drastically reduced convection speed in the slow and dense heavy ion plasma near Titan, the satellite carries a bundle of “fossilized” magnetic field lines from the magnetosphere in the magnetosheath. Furthermore, the passage through Saturn's magnetopause goes along with a disruption of Titan's pick-up tail. Although the tail is not detached from the satellite, large clouds of heavy ion plasma are stripped of its outer flank, featuring a wave-like pattern. Whereas in case (B) under parallel flow conditions there is only a small retardation of about 5 min between the passage of Titan through the magnetopause and the reconfiguration of the pick-up tail, the tail reconfiguration in the case (A) scenario is completed not until 25 min after the magnetopause passage. The lifetime of fossil fields in the moon's ionosphere is approximately 25 min, regardless of whether parallel or antiparallel flow conditions are applied.  相似文献