نتایج جستجو برای: 2011 satellites and brewer ground station 2002
تعداد نتایج: 16890544 فیلتر نتایج به سال:
The manuscript by Zempila et al. describes the validation of TEMIS UV products (specifically daily doses for erythemal UV, Vitamin D production, and DNA-damage) with ground-based measurements at Thessaloniki, Greece. Ground-based measurements are from a multi-filter radiometer, which was calibrated against a Brewer spectrophotometer using a Neural Network (NN) technique. The NN model appears to...
In recent decades, satellite and model- based precipitation products has attracted attention of the scientists and researchers in hydrology and other disciplines. The purpose of this research is quantitative comparison of MERRA and GPM satellite precipitation products with ground station precipitation values as reference data in Kashafrud basin. The important point about these data is their ...
A new approach with the ability to use the multiple observations based on the least square approach has been proposed for initial orbit determination. This approach considers the Earth’s Oblateness by using the developed Lagrange coefficients. The efficiency of the proposed method has been tested in two scenarios. The first scenario is to use the simulated and the second one is to utilize the r...
The history of depletion of stratospheric ozone over Antarctica in the austral spring is well known and well documented from the time of the discovery [Farman et al, 1985]. The rapid increase in this depletion during the 1990s [Solomon, 1999] is now being followed by a leveling off of the annual depletion [Salby et al., 2011]. The cause of this depletion again is well known; excess stratosphere...
This study presents observations of nighttime spread F/ionospheric irregularities and Es at low middle latitudes in the South East Asia longitude China sectors during recovery phase 7–9 September 2017 geomagnetic storm. In this study, multiple observations, including a chain three ionosondes located about 100°E, Swarm satellites, Global Navigation Satellite System (GNSS) ROTI maps, were used to...
The effect of troposphere on the signals emitted from global navigation satellite system (GNSS) satellites, appears as an extra delay in the measurement of the signal traveling from the satellite to receiver. This delay depends on the temperature, pressure, humidity as well as the transmitter and receiver antennas location. In GNSS positioning, tropospheric delay effects on accuracy of differen...
Soil temperature (tB) was determined down to 2 m below ground level at 8 locations in the city of Oberhausen, Ruhr area, Germany, between August 2010 and July 2011 to investigate the subsurface urban heat island (SUHI) and its impact on drinking water quality. The soil temperatures obtained in Oberhausen demonstrate typical location-dependent behaviour. At the depth of drinking water pipes (1 t...
The Formation Autonomy Spacecraft with Thrust, Relnav, Attitude, and Crosslink (FASTRAC) project from the University of Texas at Austin has developed two nanosatellites as the winner of the University Nanosat-3 Competition. Both satellites have been manifested for a launch provided by the Space Test Program (STP) in December of 2009. The FASTRAC satellites will demonstrate the following enablin...
There is widespread investment of resources in the fields of Computer Science, Science, Technology, Engineering, Mathematics (CS-STEM) education to improve STEM interests and skills. This paper addresses the goal of revolutionizing student education using collaborative gaming and competition, both in virtual simulation environments and on real hardware in space. The concept is demonstrated usin...
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