Geophysical surveys
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Evaluation Procedures for the Potential Harmonic Coefficients of a Generally Shaped Polyhedron
Geophysical surveys - - Trang 1-34 - 2023
Two computational strategies for the evaluation of the spherical harmonic coefficients of the gravitational potential due to a generally shaped homogeneous polyhedral source are examined in detail. The techniques are implemented numerically for the known asteroid shape models of Eros and Didymos. The aim of the investigation is to quantify specific numerical aspects of the two algorithms, such as ......
Spatial Patterns of Sea Level Variability Associated with Natural Internal Climate Modes
Geophysical surveys - Tập 38 - Trang 217-250 - 2016
Sea level rise (SLR) can exert significant stress on highly populated coastal societies and low-lying island countries around the world. Because of this, there is huge societal demand for improved decadal predictions and future projections of SLR, particularly on a local scale along coastlines. Regionally, sea level variations can deviate considerably from the global mean due to various geophysica......
Portable magnetometer theodolite with fluxgate sensor for earth's magnetic field component measurements
Geophysical surveys - Tập 6 - Trang 233-239 - 1984
A new portable magnetometer theodolite with fluxgate sensor has been developed for measuring the components of the earth's magnetic field. With this instrument, used as a null detector, it is possible to make absolute measurements of declination (D) and inclination (I). The compensation of the main magnetic field allows direct intensity measurements (H, X, Y, Z components); in this case the calibr......
Hydrodynamical Modeling Of Oceanic Vortices
Geophysical surveys - Tập 22 - Trang 179-263 - 2001
Mesoscale coherent vortices are numerous in the ocean.Though they possess various structures in temperature and salinity,they are all long-lived, fairly intense and mostly circular. Thephysical variable which best describes the rotation and the density anomaly associated with coherent vortices is potential vorticity. It is diagnostically related to velocity and pressure, when the vortex is station......
SOLAR-TERRESTRIAL AND CLIMATIC PHENOMENA IN RELATION TO SOLAR INERTIAL MOTION
Geophysical surveys - Tập 18 - Trang 131-146 - 1997
The time series of solar and volcanic activities have been processed to show, mostly by means of statistical characteristics, the exceptional and recurring pattern of these phenomena in the intervals of the exceptional and recurring pattern of solar motion, i.e. in the intervals of the Sun's motion along the trefoils which reoccur in steps of 178.7 years. Nearly the same sets of five sunspot cycle......
Perfect zerophase sections, fact or fiction?
Geophysical surveys - Tập 10 - Trang 225-304 - 1989
The desired result of an optimum seismic data processing sequence, is a broad band zerophase section, i.e. a bandpassed version of the actual reflectivity function. However, a lot of socalled zerophase-sections still carry a significant phase-error, which is due to unrealistic assumptions in the processing stream in terms of the design of standard processes as for example deconvolution. The two ma......
Correction for distortions of magnetotelluric fields: Limits of validity of the static approach
Geophysical surveys - Tập 13 Số 4-5 - Trang 309-340 - 1992
MASS BALANCE OF POLAR ICE FROM LONG WAVELENGTH FEATURES OF THE EARTH'S GRAVITATIONAL FIELD
Geophysical surveys - Tập 18 - Trang 313-326 - 1997
We have used satellite solutions to the low degree zonal harmonics of the Earth's gravitational potential, and rates of surface accumulation to partially constrain, by means of repeated forward solution, the time rates of thickness change over the Antarctic and Greenland Ice Sheets (dTA and dTG respectively). In addition to the observed zonal coefficients j2 through j5 we impose only one other con......
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