TEC introduced high ratios of std(Tbmeas-Tbmodel)/ radio_accuracy X. Yin, J. Boutin LOCEAN.

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Presentation transcript:

TEC introduced high ratios of std(Tbmeas-Tbmodel)/ radio_accuracy X. Yin, J. Boutin LOCEAN

At QWG 6, some of us noticed that ratios of std(Tbmeas-Tbmodel)/radio_accuracy are very high in the top-left of the FOV (desc Nov.) Why? TEC? Given that we have L1c with different versions of TEC now, the effect of strong TEC on the ratios of std(Tbmeas-tbmodel)/radio_resolution can be studied.

Method 1. 5 descending orbits in November 2010 between 5S and 45S. mean TEC is around 20 tecu 2. 3 descending orbits in July 2010 between 5S and 45S. mean TEC is around 10 tecu Flag: Sun point + Suntail

Part I, Nov 2010, 5 descending T004554_ T T002911_ T T013018_ T T005122_ T T011335_ T L1op v504 DPGS reprocessing Consolidated TEC FTT June 2011 L1pp v500 Sun on, Deimos IRI predicted TEC FTT July 2010

5S-45S Mean consolidated TEC = 20.2 tecu Mean IRI predicted TEC = 25.0 tecu predicted

Consolidated TEC IRI TEC X pol. std(Tbmeas-Tbmodel)/ radio_accuracy std(Tbmeas)/ radio_accuracy std(Tbmodel)/ radio_accuracy

Consolidated TEC IRI TEC Y pol. std(Tbmeas-Tbmodel)/ radio_accuracy std(Tbmeas)/ radio_accuracy std(Tbmodel)/ radio_accuracy

Consolidated TEC T3 std(Tbmeas-Tbmodel)/ radio_accuracy std(Tbmeas)/ radio_accuracy IRI TEC std(Tbmodel)/ radio_accuracy

IRI TEC OTTConsolidated TEC OTT X pol. Y pol. diff

IRI TEC OTT T3 Consolidated TEC OTT diff

Part II, July 2010, descending T003344_ T T005556_ T T001658_ T L1op v504 DPGS reprocessing Consolidated TEC FTT June 2011 L1pp v504 GPOD IRI predicted TEC FTT July 2010

5S-45S Mean consolidated TEC = 9.6 tecu Mean IRI predicted TEC = 14.5 tecu predicted

Consolidated TEC IRI TEC X pol. std(Tbmeas-Tbmodel)/ radio_accuracy std(Tbmeas)/ radio_accuracy std(Tbmodel)/ radio_accuracy

Consolidated TEC IRI TEC Y pol. std(Tbmeas-Tbmodel)/ radio_accuracy std(Tbmeas)/ radio_accuracy std(Tbmodel)/ radio_accuracy

Consolidated TEC T3 std(Tbmeas-Tbmodel)/ radio_accuracy std(Tbmeas)/ radio_accuracy IRI TEC std(Tbmodel)/ radio_accuracy

IRI TEC OTT Deimos v500 Consolidated TEC OTT reprocessing X pol. Y pol. diff FTT July 2010 June 2011;less galaxy signal

IRI TEC OTT T3 Consolidated TEC OTT diff

Conclusions 1.Consolidated TEC is lower than IRI predicted TEC 2.With consolidated TEC, ratios of std(Tbmeas- Ybmodel)/radio_accuracy are lower than those computed with IRI predicted TEC, but still too high in the front of the FOV compared with other regions in the FOV. 3.High ratios of std(Tbmeas-Tbmodel)/radio_accuracy could be caused by bad TEC: more accurate TEC, especially when and where Tb sensitivity to TEC is strong (see presentation by JLV and PW). 4. Compared to TX and TY, T3 is more sensitive to variations of TEC in the front of FOV, descending orbits, between 45S-5S. 5. Large influence of FTT on OTT!!