1,164 research outputs found
Remote sensing of ocean currents using ERTS imagery
Major ocean currents such as the Loop Current in the eastern Gulf of Mexico have surface manifestations which can be exploited for remote sensing. Surface chlorophyll-a concentrations, which contribute to the shift in color from blue to green in the open sea, were found to have high spatial variability; significantly lower concentrations were observed in the current. The cyclonic edge of the current is an accumulation zone which causes a peak in chlorophyll concentration. The dynamics also cause surface concentrations of algae, which have a high reflectance in the near infrared. Combining these observations gives rise to an edge effect which can show up as a bright lineation on multispectral imagery delimiting the current's boundary under certain environmental conditions. When high seas introduce bubbles, white caps, and foam, the reflectance is dominated by scattering rather than absorption. This has been detected in ERTS imagery and used for current location
Remote sensing of ocean current boundary
There are no author-identified significant results in this report
Remote sensing of ocean current boundary layer
There are no author-identified significant results in this report
Deep sea tides determination from GEOS-3
GEOS 3 altimeter data in a 5 degree X 5 degree square centered at 30 deg N, 70 deg W were analyzed to evaluate deep sea tide determination from a spacecraft. The signal to noise ratio of known tidal variability to altimeter measurement of sea level above the ellipsoid was 0.1. A sample was obtained in a 5 deg x 5 deg area approximately once every four days. The randomly spaced time series was analyzed using two independent least squares techniques
The polarised gluon density from di-jet events in DIS at a polarised HERA
We present a possible direct measurement of the polarised gluon density
in LO from di-jet production in polarised deep inelastic ep
scattering, assuming the kinematics of the HERA collider. We show the
sensitivity to the x-dependence of and to the first moment in the range , assuming the electron and proton
beam of HERA being polarised to 70% and an integrated luminosity of at least
200 pb. We include in our study hadronisation and higher order effects,
as well as realistic detector smearing and acceptance. We find that the
statistical and systematic uncertainties are small enough to distinguish
between different parametrizations for , which all are in
accordance with present data. We stress that at HERA an x-range could be
measured, that is not accessible to any other present or proposed experiment.Comment: 15 pages, 9 figures, Contributed paper to the Proceedings of the
Workshop on Physics at HERA with Polarized Protons and Electron
An assessment of the potential contributions to oceanography from Skylab visual observations and hand-held photography
There are no author-identified significant results in this report
Oceanographic observation of New York Bight from ERTS-1
The author has identified the following significant events. The Earth Resources Technology Satellite made a transit over New York Bight on 16 August, 1972. Imagery from this transit shows several oceanographic features that demonstrate the usefulness of remote sensing for large area, synoptic observation of changes in water quality in the coastal zone. Both the extent and turbulent character of the Hudson River plume are discernible in the image. Residue from a dump of waste acid is visible over a five mile area in the apex of the Bight. Little dispersion of this residue has occurred which suggests that this feature will be a persistent signature in images from future satellite transits
Asymmetry distributions and mass effects in dijet events at a polarized HERA
The asymmetry distributions for several kinematic variables are considered
for finding a systematic way to maximize the signal for the extraction of the
polarized gluon density. The relevance of mass effects for the corresponding
dijet cross section is discussed and the different approximations for including
mass effects are compared. We also compare via the programs Pepsi and Mepjet
two different Monte Carlo (MC) approaches for simulating the expected signal in
the dijet asymmetry at a polarized HERA.Comment: 18 pages, LaTeX, minor stylistic changes for Z.Phys.
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