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Taschenbuch. Condizione: Neu. Neuware - The total electron content (TEC) contribution to a Parameterized Real-time Ionospheric Specification Model (PRISM) calculation has been studied using protonospheric TEC measurements made by Global Positioning Satellites (GPS). Including the protonosphere proved challenging to both the calibration of GPS measurements and execution of PRISM. Though 46 days of GPS measurements were acquired, only 40 were successfully calibrated, and only 35 of those were used in the study. Data issues such as availability and completeness as well as measurement quality affected 6 of the days used. Calibration was done at Pittsburgh by excluding all measurements below 40.75 N. latitude cutoff. This latitude produced a plasmaspheric contribution to GPS TEC of 2.5 -- 3.0 TEC units (TECu). Five calibrated days were collected during geomagnetic storm and recovery days, and could not be used in PRISM, reducing the data set to 35 days. Throughout the data, GPS trajectories added up to 3 TECu of error due to low elevation angles and multipath affects. PRISM was found to model the ionosphere with 10.4% to 17% average error, and included a protonospheric contribution result of 1.0 TECu. GPS measurement errors on the order of 3.0 TECu overwhelmed the 17% errors found in PRISM under the same conditions. During quiet periods, the model worked well, with most of the error coming from the GPS TEC measurements.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.…

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