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EFI TII PREL Datasets Johnathan Burchill David Knudsen Alexei Kouznetsov Matthew Patrick Acknowledgments Swarm 5 th Data Quality Workshop, IPGP, Paris.

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Presentation on theme: "EFI TII PREL Datasets Johnathan Burchill David Knudsen Alexei Kouznetsov Matthew Patrick Acknowledgments Swarm 5 th Data Quality Workshop, IPGP, Paris."— Presentation transcript:

1 EFI TII PREL Datasets Johnathan Burchill David Knudsen Alexei Kouznetsov Matthew Patrick Acknowledgments Swarm 5 th Data Quality Workshop, IPGP, Paris

2 Rationale for releasing TII PREL datasets 24/7 routine processing presently not feasible Measurements often do not behave well, hindering calibrations Key calibration parameters vary more rapidly than anticipated Selectivity: good data need to be identified by hand Need for new TII L1b algorithms Improved quality flags (selectivity) Handle varying calibration parameters Improve mixing of signals from two sensor Interim: Prototype processor preliminary (PREL) data Initial blocks for summer 2014 (Swarm A and B) Case by case 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 2

3 TII PREL Coverage 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 3

4 TII PREL Particulars PREL 0101 Initial release, used early ‘sandbox’ TII processor Swarm A, key scientific products only PREL 0102 Official prototype TII processor Swarm B More products PREL 0103 All Satellites, from early commissioning period PREL 0201 Linearly- interpolated parameters New estimates for detector centres Additional details in PREL User Manual from https://earth.esa.int/web/guest/swarm/data-access/dataset-history 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 4

5 Based on fitting circles to TII ring anomaly All six sensors Swarm A H sensor More accurate detector centre estimates Recent Developments 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 5

6 Recent Developments Aim: reduce magnitude of low-latitude northward flows Using Vertical sensor for along-track flow PREL 0201 Improved ion energy calibration 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 6

7 Recent Developments Reduces ‘square wave’ in Vnorth Using Vertical sensor for along-track flow PREL 0201 Improved ion energy calibration 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 7

8 Linear interpolation PREL 0201 Recent Developments Varying calibration parameters 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 8

9 Recent Developments Calibrate CCD sensor directions instead of instrument direction cosines 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 9

10 Fiori et al. (NRCan) noted large spikes in along-track ion flows (Swarm A, PREL 0101) Things to watch out for 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 10

11 Periodic (daily) noise in ion velocities Large along-track flows (systematically > few km/s) Additional calibration may help Things to watch out for 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 11

12 Things to watch out for High-latitude ion upflow: Swarm A, PREL 0101 Large offsets in ion flow Noisy and elevated ion temperature ‘Spike trains’ in electron temperature, spacecraft potential 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 12

13 Things to watch out for St.Patrick’s day storm 2015 (PREL 0201) TII Quality Flag > 20 (Also: Maneuver ID > 0) 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 13

14 Further plans for PREL Continue work on PREL 0201: improve time-varying calibrations, all satellites Flag ion flows when H and V sensors disagree in along- track component Hand-pick more data for release, including those from recent single-orbit operations and requests for specific times 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 14

15 We welcome data requests Used with caution, the TII PREL data have much to offer Warm ion upflow splashing down poleward of cleft (PREL 0101: LP data courtesy S. Burchert) 2015-09-08 Burchill TII PREL datasets Swarm 5th DQW IPGP Paris 15

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