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    <dct:description>The Particle Environment Monitor (PEM) on NASA's Upper Atmosphere
                        Research Satellite (UARS) measures the type, amount, energy, and
                        distribution of charged particles injected into the Earth's
                        thermosphere, mesosphere, and stratosphere.  PEM consists of four
                        instruments: the Atmospheric X-Ray Imaging Spectrometer (AXIS),
                        the High Energy Particle Spectrometer (HEPS), the Medium Energy
                        Spectrometer (MEPS), and the Vector Magnetometer (VMAG).
                        The UARS PEM level 2 MEPS daily product (UARPE2MEPS) contains
                        the electron and proton high-resolution spectral
                        data converted to number intensity units from the MEPS sensors mounted on
                        both the zenith and nadir UARS booms.  MEPS data covers the rough range from
                        1 eV - 5 eV to 32 keV, where the lower energy cutoff is determined by
                        internal instrument protection potentials.  There are five analyzers mounted
                        in different directions on the zenith boom, each of which contains an electron
                        and ion sensor.  These analyzers are mounted at -23.7 deg, +6.3 deg,
                        +21.3 deg, +36.3 deg, and +66.3 deg with respect to the spacecraft -z axis and
                        along the spacecraft +y axis.  There are three analyzers mounted in different
                        directions on the nadir boom, each of which contain only an electron sensor.
                        These analyzers are mounted at -158.7 deg, +156.3 deg, and +126.3 deg, with
                        respect to the spacecraft -z axis and along the spacecraft +y axis.  All MEPS
                        analyzers accumulate a spectrum in 2.046 sec.
                        There is one data file per day for the PEM MEPS product, and the
                        temporal coverage is from Oct. 1, 1991 to Aug. 23, 2005. Spatial
                        coverage for the MEPS product ranges between -57 and +57 deg latitude.
                        The MEPS data files are written in network binary format. For more
                        information please review the PEM MEPS data format guide.</dct:description>
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