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Aerocentric longitude of the sun, Ls, is used as an angular measure of the Mars year: Ls = 0, 90, 180, 270 corresponds to the start of northern spring, summer, fall, and winter, respectively.
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The Sundstrand QA 1200 accelerometer, contained in the MGS Inertial Reference Unit package is thermostatically controlled to maintain an internal temperature to within 0.12 K. This has resulted in the temperature-sensitive bias of the z-accelerometer being highly stable, to within a small fraction of 1% throughout the aerobraking phase.
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The 1.26-nbar (nanobar) reference level corresponds to the height of the main ionospheric (F1-layer) peak at the subsolar point (6). A. I. F. Stewart derived systematic trends in the height of the 1.26 nbar pressure level based on Mariner 9 and Viking radio occultation data (27) and then estimated (Internal JPL Report) a short-period (orbit-to-orbit) variation of ±2.8 km as a root-mean-squared residual. Assuming a 7.5-km atmospheric scale height, this indicated a variability of ±35% (1 σ). The height scale for the MTGCM model is calibrated using this 1.26-nbar level height as a local reference level.
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The results of the harmonic analyses of MGS accelerometer densities normalized to 125 km for the phase of wave 2 (measured from wave 2 minimum) for the mission through P114 are as follows: 1. Passes 10-18 (P010-P018), longitude of the wave 2 minimum -14°E; 2. P037-P046, +3°E; 3. P040-P049, +3°E; 4. P045-P054, +16°E; 5. P050-P059, +15°E; 6. P055-P064, +13°E; 7. P060-P069, -12°E; 8. P065-P074, -3°E; 9. P070-P079, -8°E; 10. P068-P094, -18°E; 11. P090-P099, -3°E; 12. P095-P104, 1°E; 13. P100-P109, -3°E; 14. P105-P114, 8°E. The mean phase ±1 standard deviation for the 14 cases is 2°E ± 10° (for the wave 2 minimum). Variations in the time intervals of analysis is required to obtain longitudinal coverage for changing orbital periods.
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7144263338
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note
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We thank the Mars Surveyor Operations Project at Jet Propulsion Laboratory (JPL) and the MGS spacecraft operations team at Lockheed Martin Astronautics (Denver, CO) for their support in providing the MGS Accelerometer Team with the accelerometer and ancillary data used in this study. This work was funded in part by the JPL, Pasadena, CA.
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