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