Solar-B Mission Preparation
Len Culhane – UK EIS Principal InvestigatorLouise Harra – UK Project Scientist
David Williams – UK EIS Chief Observer
Mullard Space Science LaboratoryUniversity College London
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
Solar-B Spacecraft and Mission EIS Team Roles and Responsibilities
UK (MSSL (PI), Birmingham, RAL): CCD cameras, Structure, On-board Processor, Filter Housing, Calibration
USA (NRL, GSFC, Columbia): Optics, Coatings, Mechanisms, Filters,Japan (NAOJ, ISAS): Testing, Integration with SpacecraftNorway (UiO): EGSE and Quick-look Software
All participants are involved in Post-launch Mission Operations and Data Analysis
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
Solar Optical Telescope (SOT)
Largest optical telescope (d = 0.5m) to observe Sun from space
Diffraction-limited (0.2 – 0.3 arcsec) imaging in range 388 – 668 nm
Vector magnetic field and velocity measurement at the photosphere
X-Ray Telescope (XRT)
High angular resolution ( < 2 arc sec) coronal imaging
Wide temperature coverage: 1 MK < Te < 30 MK
EUV Imaging Spectrometer (EIS)
Coronal raster imaging at 2 arc sec
Plasma diagnostics (Te, ne, v) in 170 – 210Å and 250 – 290Å ranges
Solar-B Mission Instruments
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
• Large Effective Area in two EUV bands: 170-210 Å and 250-290 Å– Multi-layer Mirror (15 cm dia ) and Grating; both with optimized Mo/Si Coatings– CCD camera; Two 2048 x 1024 high QE back illuminated CCDs
• Spatial resolution: 1 arc sec pixels/2 arc sec resolution
• Line spectroscopy with ~ 25 km/s per pixel sampling and ~ 3 – 5 km/s Doppler velocity estimates for ≥ 100 photons per line
• Field of View : – Raster: 6 arc min×8.5 arc min; – FOV centre moveable E – W by ± 15 arc min
• Wide temperature coverage: log T = 4.7, 5.4, 6.0 - 7.3 K
• Simultaneous observation of up to 25 lines/spectral windows
EIS - Instrument Features
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
EIS Optical Diagram
Grating
Front Baffle
Entrance Filter
Primary Mirror
CCD Camera
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
EIS Field-of-View
360
512
EIS Slit: 1 or 2 arc sec
Maximum FOV for raster observation
512
900 900
Raster-scan range
Shift of FOV center with coarse-mirror motion
250 slot
40 slot
512
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
2Mbps max1.3 Mbps
EIS Data Flow
CCD Readout Electronics EIS ICU
Large hardware CCD window
S/C MDP
Small spectral window (25 max)
Data compressionDPCM(loss less) or 12bit-JPEG
250 kbps max for short duration, 40 kbps average
Telemetrydata format
Average rate depends on number of downlink station.
1 slit obs. 40 slot obs. 250 slot obs.Spec.width 16 40 250Spatial width 256" 512" 256"No. of lines 8 4 4Compression 20% 20 % 20%Cadence 2 sec 5 sec 15 secRate 38.4 kbps 38.4 kbps 40 kbps
10 min cadence for 44 rastering
Observation tablecontrol
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
EIS Instrument Pre-Calibration
EIS Instrument Completed
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
KSC Receiver & Data Distribution
System
SatelliteCommon
Health Check System
InstrumentsHealth Check
System
SIRIUS Database
Daily Health Check of
Instrumentby CO
Daily Status Report of
Instrument
Level-QReformat
Level-Q Data(JPEG, MPEG)
Health Check
Reformat
Satellite Common
Health Check System
InstrumentHealth Check
System
Health Check
Reformat
Kagoshima Space Centre
ISAS Spacecraft Operations Centre
Quick Look system for non-operation team
(Web System)
Data from ESA/Norway Svalbard Ground Station
Spacecraft Operation
Data ReformattingISAS Solar-B Science Centre
Level-0Reformat
Level-0 data
Create Calibration
data
Pre-launch test data
Pointing dataOrbital
Environments(SAA, Night, etc.)
Calibration data
Level-1 Reformat
(Calibration)
Level-1 data
Level-2 Reformat(Physical Quantities Derivation)
Level-2 data
Solar-B Data Archiving System
SOT/FPP Data
a)
b)
c)
Solar-B Mission Data Acquisition
• Data are stored on-board in an 8 Gbit mass memory
• Baseline instrument memory allocations are:- SOT/FPP → 70%- EIS/XRT → 15% each
• Data downlinked to Svalbard ground station (ESA/Norway) on 15 orbits/day - memory dumped once per orbit
• EIS average data rate → 45 kbps- x 5 -7 greater with lossy compression
• Command uplinks only from Kagoshima
• Quick-look data at ISAS and Kagoshima
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
Proposals ofObservation
Observing Plansof Solar-B Team
Daily Operation Meeting
Real Time Operation @ KSC
Solar-B Observation
Scientists
The Flowchart of Solar-B Operation
Data Reformat System
Solar-BDatabase System
Solar-B/Satellite & PIHealth Check System
Operation Planning @ SSOC
Weekly Operation Meeting
Monthly Operation Meeting
ScientistsSolar-B Team
<Every 15th(TDB) Meeting @ Tel-Conference>Participants : Project Manager, PIs,
Scientific Schedule Coordinator, Database Coordinator, Chief ObserversAims : Status Review of Satellite, Instruments and Database Adoption of proposals Discussion of the observation plans and staffing for following 3 months Decision of the Monthly Observation Plan
<Every Friday (TDB) Meeting @ ISAS>Participants : Project Manager, Chief Observers, Scientific Schedule Coordinator (JAPAN),
Supporter, Ground-base Contacts Coordinator, Chief Planner
Aims : Status review of satellite, instruments for the previous week, Selection of some target regions Review of observation plans for up-coming week
(Pointing, Table uploading schedule)
<Every Morning (10:30 JST [TDB]) Meeting @ ISAS>Participants : Chief Observers, Supporter, Chief Planner Ground-base Contacts CoordinatorAims : Status review of telescopes and
satellites for the previous day. Allotment of the data recorder to telescopes Final decision of the target region (Pointing) Decision on the plan for real-time operations
• Mission operations will be conducted from the ISAS Spacecraft Operations Centre in Fuchinobe, Japan
• Solar-B team observing plans and community proposals will be discussed at monthly meetings
• Each instrument team will have a Scientific Schedule Coordinator who will organize the preparation of instrument proposals and their integration in the overall mission observing plan
• Weekly and daily planning meetings allow flexibility to respond to changing solar conditions
Solar-B Mission Operations
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
Level-0 and Cal DataLevel-2 Data (FPP)
Level - 0
Reformat
Solar - B Database
in Japan
Solar - B Database
in US
Solar - B Database
in UK
FPP Level -1 and -2
Reformat at Lockheed
Solar-B Mission Data Distribution
• Data distributed to UK and US in compressed level – 0 form
• Because of complexity, FPP vector magnetogram data are transmitted in level – 0 form to Lockheed Palo Alto
• They are processed to level – 2; vector magnetograms are then sent to the UK and Japan
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
Data Handling and Observation Planning
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
UK Data Processing, Storage and Availability
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
UK Solar-B Proposal Handling
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
UK Solar-B Data Centre (SDC) at MSSL
• The SDC will maintain: analysis guides on-line for users of all three software sets an email helpdesk and web discussion site for community support a record of Solar-B observing plans and schedules on the centre web site
• A software tool will be made available for preparation of observing proposals
• The UK SSC will help in this process by assisting the UK community in making contact with members of the other Solar-B instrument teams
• All Solar-B mission data will be archived at the SDC, stored at the Atlas Data Centre and made available through Grid networks e.g. Astrogrid
• Anticipated data volume for the three year mission life is ~ 25 Tbyte
• Relevant Solar-B software will be held at the SDC and periodically updated to reflect developments in the UK, US and in Japan
Solar-B Mission Timeline
• Pre-launch period will include planning, commanding and data acquisition rehearsals
• Observing with Solar-B, using any or all of EIS, XRT and SOT/FPP, will require the preparation of proposals
• These will be presented by the UK Scientific Schedule Coordinator (SSC) to the Solar-B team at the monthly planning meetings in Japan
• Review of operations will take place 18 months after mission start Possibility for more remote operation for Solar-B from US and UK
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
SUMMARY
• Following SOHO CDS, the EIS instrument will provide the next steps in EUV spectral imaging of the corona: – x 10 enhancement in Aeff from use of multilayers and CCDs– x 5 enhancement in spectral resolution– x 3 enhancement in spatial resolution– Like CDS; absolute calibration performed to ± 20%
• EIS will:– Address a broad range of coronal science topics – Enable major goals of Solar-B mission by relating coronal
response to magnetic flux emergence and material flows
Astrogrid Solar/STP Planning Meeting, UCL, 22 Feb, 2006.
Preparing for Solar-B
END OF TALK