Browsing by Author "Kuzmicz-Cieslak, Magdalena"
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Item Evaluation of the 2013 NGSLR and MOBLAS-7 Co-location Dataset at GGAO(National Aeronautics and Space Administration, 2013-11-13) Pavlis, Erricos C.; Kuzmicz-Cieslak, Magdalena; McGarry, Jan F.; Clarke, Christopher B.; Horvath, Julie; Donovan, HowardItem First results of the LARES 2 space experiment to test the general theory of relativity(Springer, 2023-11-29) Ciufolini, Ignazio; Paris, Claudio; Pavlis, Erricos C.; Ries, John; Matzner, Richard; Paolozzi, Antonio; Ortore, Emiliano; Bianco, Giuseppe; Kuzmicz-Cieslak, Magdalena; Gurzadyan, Vahe; Penrose, RogerThe LAGEOS 3 (today LARES 2) space experiment was proposed in the eighties by the Physics Department and by the Center of Space Research (CSR) of the University of Texas (UT) at Austin and by the Italian Space Agency (ASI) to test and accurately measure frame-dragging, with the strong support of John Archibald Wheeler, director of the Center for Theoretical Physics of UT Austin. Frame-dragging is an intriguing phenomenon predicted by Einstein’s theory of general relativity which has fundamental implications in high-energy astrophysics and in the generation of gravitational waves by spinning black holes. LAGEOS 3 was reproposed in 2016 to the Italian Space Agency and to the European Space Agency as a technologically much improved version of LAGEOS 3 under the name LARES 2 (LAres RElativity Satellite 2) and then successfully launched in 2022 with the new launch vehicle VEGA C of ASI, ESA and AVIO. Today, after almost 40 years since the original proposal, we report the first results of the LARES 2 space experiment to test general relativity. The results are in complete agreement with the predictions of Einstein’s gravitational theory. Whereas previous results already confirmed the frame-dragging prediction, the conceptual relative simplicity of the LARES 2 experiment with respect to the previous tests with the LARES and LAGEOS satellites provides a significant advance in the field of tests of general relativity.Item Geocenter Motion Causes and Modeling Approaches(NASA, 2008-10) Pavlis, Erricos C.; Kuzmicz-Cieslak, MagdalenaWe concentrate here on Earth’s “Center of Mass”, the geocenter, the fidelity and accuracy with which SLR defines its average location over decades and monitors its seasonal variations associated with the redistribution of geophysical fluids.Item The ILRS Analysis Centers’ Report on the Evaluation of ITRF2020P(EGU, 2022-05) Pavlis, Erricos C.; Luceri, Vincenza; Basoni, Antonio; Sarrocco, David; Kuzmicz-Cieslak, Magdalena; Evans, Keith; Bianco, GiuseppeItem The ILRS Contribution to ITRF2020(EGU, 2021-04) Luceri, Vincenza; Pavlis, Erricos C.; Basoni, Antonio; Sarrocco, David; Kuzmicz-Cieslak, Magdalena; Evans, Keith; Bianco, GiuseppeItem Transitioning the NASA SLR network to Event Timing Mode for reduced systematics, improved stability and data precision(Springer Berlin Heidelberg, 2019-11-21) Varghese, Thomas; Ricklefs, Randall L.; Pavlis, Erricos C.; Kuzmicz-Cieslak, Magdalena; Merkowitz, Stephen M.NASA’s legacy Satellite Laser Ranging (SLR) network produces about one-third of the global SLR data to support space geodesy. This network of globally distributed stations has been using Time Interval Units (TIU) for range measurements for the last 25 + years. To improve the reliability of the SLR network and satisfy the need for stable millimeter precision data, a phased replacement of the TIUs in the network with picosecond-precise Event Timer Modules was initiated in 2015. This scheme allowed the time of flight and laser transmit epoch measurement to one picosecond resolution. For a network with global scientific impact, transitioning to a new data generation metrological scheme requires significant data scrutiny and long-term science data validation. Any long-term testing/measurement has the potential to interrupt the station’s daily operational data flow to the International Laser Ranging Service (ILRS) as the station under test will have to put its test data into quarantine. We have demonstrated a very effective way to test and implement the new device without removing the old hardware and without the need for the orbit analysis. This operationally noninvasive scheme performed concurrent test measurements enabling uninterrupted operational data flow to the users, while allowing simultaneous test data capture for short- and long-term systematics and stability analysis. Extensive analysis of the test data was performed by the NASA SLR engineering team and the ILRS Analysis Standing Committee, to uncover biases and any dependencies on the satellite ranges (for nonlinear scale issues). Multi-ETM comparison was also performed at two of the SLR stations through the interchange of hardware to establish the inter-device range biases and stability. Such benchmarked hardware was subsequently sent to the remaining stations to allow traceability and normalize the network performance. The range bias intercomparison performed using the multiyear SLR data analysis agreed well with the engineering changes, thus validating the approach to flush out station-specific ranging systematics affecting precise orbit determination. Such an improvement and rebalancing of the current network will allow an orderly transition of the current NASA SLR network operating at a maximum rate of 10 Hz to the NASA next generation Space Geodesy Satellite Laser Ranging (SGSLR) network operating at 2 kHz (McGarry et al. in J Geod, 2018. https://doi.org/10.1007/s00190-018-1191-6; Merkowitz et al. in J Geod, 2018. https://doi.org/10.1007/s00190-018-1204-5).