Eis calibration and operation
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EIS Calibration and Operation. H. Hara NAOJ. Calibration on the ground. Component-level calibration - Multi-layer mirror reflectance - Multi-layer grating efficiency - Filter transmissions - CCD camera calibration - FMIR position accuracy for raster scan

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EIS Calibration and Operation

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Eis calibration and operation

EIS Calibration and Operation

H. Hara

NAOJ


Calibration on the ground

Calibration on the ground

  • Component-level calibration

    - Multi-layer mirror reflectance

    - Multi-layer grating efficiency

    - Filter transmissions

    - CCD camera calibration

    - FMIR position accuracy for raster scan

    - CMIR mechanism position accuracy for FOV setting

  • Instrument-level calibration

    - Effective area calibration: preliminary one is in SSW

    - Wavelength calibration

    - Instrumental width in emission lines short band: 47mA long band: 58mA

    - Primary mirror focus check

    - Grating focus check

Published in

Seely et al. 2004, App. Opt., 43, No7,1463


On orbit calibration

On-Orbit Calibration

  • On-Orbit calibration

    - Cross-check of effective area by using density insensitive line ratio

    - Wavelength calibration in an orbit

    - Estimation of contamination and degradation

    - Estimation of absorption by Earth’s atmosphere in low-altitude sun-synchronous orbit

    - Check of MDP compression (DPCM/JPEG) performance using the actual solar spectra/images.

    - Calibration rocket flight planned (EUNIS) by NASA GSFC group


Eis science operation so

EIS Science Operation (SO)

  • Team core science

  • Initial science targets

  • Proposal from users

Preparation for EIS SO

Merging EIS SO

in S/C operation

- Obs. table

- S/C CMDs

EIS

Planning

EGSE

Observation

Planning

Science

ISACS-PLN

Feedback

Plan approved

for EIS operation

Feedback

Final S/C plan

Line selection

Exp. duration

Compression

FOV size etc.

Data rate

Compression

Instrument CAL

Check of

Obs. Table

using PM

Outcome

Uplink station

Analysis

Data check

Data for analysis

Level0 data

Level1 data

Level2 data

Spacecraft

Data

Reformat

EGSE

Users

Observation

in orbit

Telemetry

Downlink stations

JAXA data storage

Data centers


Summary

Summary

  • Deep understanding of the Calibration Issues and Science Operation leads to good science.

    For easy analysis knowledge of calibration will be installed in EIS analysis software.

  • Various observations can be performed with the EIS Sequence structure (EIS observation table).


Eis calibration and operation

END


Eis calibration spectrum 2 slit

Al III, Al IV and Ne IV lines

EIS Calibration Spectrum 2" slit

  • Calibration is being carried out with the source used for SOHO CDS calibration (Hollandt et al., 2002, Lang et al., 2000)

  • Source is a secondary standard radiometrically calibrated by PTB, Berlin at the BESSY I electron storage ring

  • Stable high-current hollow-cathode discharge lamp provides appropriate EUV emission lines

  • Following EIS calibration, the source will be re-calibrated at BESSY II


Eis effective area

EIS Effective Area


Eis science targets

EIS Science Targets

Bright Point

Limb/beyond the limb

Active region/Flares

Quiet Sun/

Network brightening

Coronal Hole

Coronal Hole Boundary

Polar Plume


Data rate

Data Rate

CCD1

CCD0

CCD readout

height

Software window (SW)

EIS data size to MDP

= total sum of software windows

=  (window width)i * (window height)i

Assemble all SWs

DPCM

MDP

EIS data of CCSDS format

JPEG

Compression ratio

= compressed data size/ input data size to MDP

Data rate ~ [EIS data size to MDP] * [Compression Ratio] / Cadence


Eis data flow

EIS Data Flow

Data compression

DPCM(loss less) or 12bit-JPEG

Small spectral

window (25 max)

CCD Readout

Electronics

2Mbps max

1.3 Mbps

EIS ICU

S/C MDP

control

 260 kbps max

for short duration,

45 kbps average

Large hardware

CCD window

Observation table

1 slit obs. 40 slot obs. 250 slot obs.

Spec.width 16 40 250

Spatial width 256 512 256

No. of lines 8 4 4

Compression* 25% 20 % 20%

Cadence 3 sec 6 sec 20 sec

Rate 42.7 kbps 42.7 kbps 40 kbps

Average rate depends

on number of downlink

station.

Telemetry

data format

*for 16 bit/pixel data

13 min cadence for 44 rastering


Eis observation sequence

EIS Observation Sequence

On-board S/C commands

Change SEQ

Start

Stop

Change SEQ

Start

Change SEQ

Start

Stop

Stop

OBS5

OBS1

OBS4

OBS2

OBS3

Stop

Start

Upload new plan

Uplink commands

Data

rate

Time


Eis observations

EIS Observations

An example of 240" 240" FOV

Discontinuous

raster

240 "

240 "

1" slit raster

2" slit raster

Wider instrumental width

EUV imaging of

less contamination

by other lines

40" slit raster

266" slit raster

(no mirror motion)

Contribution of

other emission lines


Mdp jpeg compression

MDP JPEG Compression

AR spectrum for 5 sec integration

Fe XII

256 pixels

Fe XII

Fe XV

Fe XI

Fe XII

Fe XII

Fe XIII

Fe XXIV

Ca XVII

Fe XIII

Fe XIV

Fe XVI

224 pixels

He II

Fe XIV


Jpeg compression error

JPEG compression error

X: signal – offset [DN] ; offset~ 500

Y: decomp( comp( Original ) ) – Original [DN]

DN17nm

DN29nm


Compression error for q 85

Compression Error for Q=85

Compression ratio = 0.19

v

FWHM

I

original

original

original

Diff/ FWHM

Diff/ I

Diff/ v

=

=

=


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