GUVI Biblio




Notice:

  • Clicking on the DOI link will open a new window with the original bibliographic entry from the publisher.
  • Clicking on a single author will show all publications by the selected author.
  • Clicking on a single keyword, will show all publications by the selected keyword.





The TIMED Spacecraft Mission Orbital Performance Fifteen Years in LEO



AuthorButler, Michael;
Keywords
Abstract

The Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) spacecraft is a NASAspacecraft designed, built and operated by The Johns Hopkins University Applied Physics Laboratory. The spacecraft was launched on December 7, 2001 for a two-yearmission. The TIMED instruments continue to provide global coverage of the Mesosphere and Lower Thermosphere Ionosphere(MLTI)region of the atmosphere (60 km to 180 km). The TIMED mission has observedthe effects of the sun on the MLTI region over a full solar cycle. TIMED has exceeded allscientific programgoals for the mission. TIMED is a low earth orbiting spacecraft with an altitude of 625 km and an inclination of 74.1\textdegree. The requirements imposed by the instruments; fields of view, pointing accuracy, jitter requirements, andanti-sun pointing of one spacecraft side;along with the sun angle variationsduring the year imposesspecial demands on the power system design. The power subsystem chosen for TIMED is an unregulated peak power tracking system with a single 50 AHr 22-cell individual pressure vessel NiH2 battery. The two driven solar array wings are populated with 140-micron single junction GaAs/Ge cells.The power system has been performing as designed with expecteddegradations tothe solar array and battery over the last fifteen years in low earth orbit.

Year of Publication2017
Journal
Volume
Number of Pages
Section
Date Published
ISBN
URLhttps://arc.aiaa.org/doi/pdf/10.2514/6.2017-4871
DOI10.2514/MIECEC1710.2514/6.2017-4871