Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5486334 | Advances in Space Research | 2016 | 12 Pages |
Abstract
The present paper is focusing on the main physical effects which drive the frequency variations of the Jason-2 USO during its flight, notably over the South Atlantic Anomaly (SAA) area. In addition to the effects of radiation we studied the effect of the residual temperature variations, in the range 8-11 °C (measured on-board). A model was established to represent these effects on the short term with empirical coefficients (sensitivities of the USO) to be adjusted. The results of fitting the model over â¼200 10-day periods, from 2008 to 2014, show the sensitivities of the Jason-2 USO to temperature and radiation. The analysis of the 6-year output series of empirical coefficients allows us to conclude that: (i) the temperature to frequency dependence is very stable along time at the level of around â1.2 · 10â12 per °C, (ii) the radiation effects are much lower than those previously detected on the Jason-1 USO with a factor > 10. The swept material used by manufacturers for the Jason-2 quartz oscillator has such properties to avoid non-linear effects >1-2 · 10â12, (iii) the model is available at 1 min or less over the Jason-2 mission, with a level of consistency of 5 · 10â13, which is the average RMS of the post-fit residuals.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
Alexandre Belli, P. Exertier, E. Samain, C. Courde, F. Vernotte, C. Jayles, A. Auriol,