Complete list of EIS FITS keywords

 

Table 1. Main header keywords

 

Keyword

Format

Description

Example

Unit

Origin

XTENSION

String

FITS file has extensions

’BINTABLE’

 

FITS

BITPIX

Byte

Nr. of bits pr. Pixel

16

 

FITS

NAXIS

Byte

Nr. of data array dimensions

2

 

FITS

NAXIS1

Integer

Bytes pr. Row

163856

 

FITS

NAXIS2

Integer

Nr. of rows

100

 

FITS

PCOUNT

Integer

Random parameter count

0

 

FITS

GCOUNT

Integer

Group count

1

 

FITS

TFIELDS

Integer

Nr. of columns

16

 

FITS

DATE

String

Date file was written

’YYYY-MM-DD’

UTC

FITSGEN[1]

ORIGIN

String

Inst. File was written

’ITA-UiO’

 

FITSGEN

DATA_LEV

Integer

FITS level (0, 1, 2)

0

 

FITSGEN

DATE_RF0

String

Date of level 0 reformat

’YYYY-MM-DDThh-mm-ss.sss’

UTC

FITSGEN

ORIG_RF0

String

Where level 0 was written

’JAXA/ISAS’

 

FITSGEN

DATE_RF1

String

Date of level 1 reformat

’YYYY-MM-DDThh-mm-ss.sss’

UTC

FITSGEN

ORIG_RF1

String

Where level 1 was written

’ITA-UiO’

 

FITSGEN

VER_RF1

String

Version of reformatter program.

‘EIS_Lev1_Reformatter Ver. 1.0b’

 

 

FITSGEN

VER_RF0

String

Version of reformatter program.

‘EIS_Lev0_Reformatter Ver. 1.0b’

 

 

FITSGEN

TELESCOP

String

Telescope

’Solar-B’

 

FITSGEN

INSTRUME

String

Instrument

’EIS’

 

FITSGEN

OBSTITLE

String

 Title of the observation

’Oscillations in sunspot umbrae’

 

PT[2]

TARGET

String

Target of Obs. (AR, QS...)

’AR’

 

PT

RAST_ACR

String

Raster acronym

’OSLO_spot_1’

 

PT

STUD_ACR

String

Study Acronym

’SUNSPOT_STUDY’

 

PT

 

 

 

 

 

 

OBS_DEC

String

A few sentences describing the properties of the obs.

Filters and time resolution are optimized for Temperature Analysis.

 

 

PT

JOIN_SB

String

Indicates joint obs between the insttuments of not

ESX, ES, EX, SX, E, S, X

 

PT

OBS_NUM

Integer

Sequential numbering of observation

100

 

PT

JOP_ID

Integer

Joint obs. Program ID nr.

20

 

PT

STUDY_ID

Long

Study ID

10

 

PT

ST_AUTH

String

Study author (”owner” of st.)

’Viggo Hansteen’

 

PT

LL_ACR

String

Line List Acronym

’LL_OSLO_SPOT1’

 

PT

LL_ID

Integer

Line List ID (unique)

20

 

PT

SOLB_SCI

String

Description of Solar-B science objectives

’Search for nanoflares in the corona’

 

PT

EIS_SC

String

Description of EIS Science Objectives

’Search for nanoflares in the corona’

 

PT

OBSERVER

String

Name of chief observer

’HANSTEEN Viggo’

 

PT

PLANNER

String

Name of chief planner

’WIKSTĮL, Įivind’

 

PT

TOHBANS

String

Name of TOHBANS

NANASHINO Gonbei, HENOHENO Moheji

 

 

PT

NOAA_NUM

Integer

Active region nr.

11315

 

PT

SCI_OBJ

String

Target phenomena. Selected from a list

AR, AFL, FL, AFS

 

PT

DATATYPE

String

Type of data (SCI ENG)

’SCI’

 

PT

TIMESYS

String

Time System of FITS file

’UTC’

 

FITSGEN

DATE_OBS

String

Raster start time

’2006-22-11T18:00:00’

UTC

MDH/TC[3]

DATE_END

String

Raster end time

’2006-22-11T19:00:01’

UTC

MDH

OBT_TIME

Long

On-board raster start time (shutter open time of first exp.)

12345.543

TI

MDH

OBT_END

Long

On-board raster end time (shutter close time of last exp.)

54321.123

TI

MDH

MAIN_ID

Integer

Raster Counter

1

 

MDH

MDPACK

Byte

# telemetry packets pr. exposure

10

 

MDH

SEQ_NR

Byte

Sequence table nr.

47

 

MDH

SLIT_NR

Integer

Slit nr.

2

 

MDH

SLIT_ID

String

Slit ID (1”, 2”, 40”, 266”)

’266”’

 

MDH[4]

LL_NR

Byte

Line List nr.

11

 

MDH

NWIN

Byte

Number of line windows

25

 

MDH

TL_ID

Long

Unique nr. for each time line entry (aka sequence)

48879

 

MDH

RAST_ID

Integer

Unique nr. for each raster

22136

 

MDH

TR_MODE

String

Tracking mode of SC/Instr.

’TR1’

 

SC[5]/HK?

FMIR_SS

Integer

Fine mirror step size

0 for sit-and-stare

> 0 for scanning 

FMIR

MDH

RAST_REQ

Integer

Number of raster exposures required

200

 

MDH

NEXP

Long

Number of exposures performed in raster

200

 

MDH

NEXP_PRP

Byte

Number of exp. Pr. Raster pos.

8

 

MDH

NRASTER

Long

Number of unique raster positions (1 for sit-and-stare)

1 for sit-and-stare

nexp/nexp_prp for scanning

 

MDH

RREP_REQ

Integer

Number of raster repeats required

2

 

MDH

RREP_PFD

Integer

Number of raster repeats performed

2

 

MDH

SREP_REQ

Byte

Number of sequence repeats required

2

 

MDH

SREP_PFD

Byte

Number of sequence repeats performed

2

 

MDH

CCDXL

Integer

Max CCD length incl scan pix.

2097

Pixels

MDH

XWS

Integer

HW (Cam) x-window start pix.

400

Pixels

MDH

XW

Integer

HW (Cam) x-window width

32

Pixels

MDH

YWS

Integer

y-window start pixel

512

Pixels

MDH

YW

Integer

y-window width

512

Pixels

MDH

XCEN

Float

Actual poitning of center of image

0.0

Arcsec

SC

YCEN

Float

Actual poitning of center of image

0.0

Arcsec

SC

CMIRR

Integer

Coarse mirror position

1

 

MDH

CRPIX1

Float

Reference Pixel in Solar-X

50.5

Pixel

PT

CRPIX2

Float

Reference Pixel in Solar-Y

512.5

Pixel

PT

CRVAL1

Float

Coordinate value of CRPIX1

0.0

Arcsec

SC

CRVAL2

Float

Coordinate value of CRPIX2

0.0

Arcsec

SC

CDELT1

Float

Pixel size in Solar-X

1.0

arcsec

Cal[6]

CDELT2

Float

Pixel size in Solar-Y

1.0

arcsec

Cal

CDELT3

Float

Pixel size in wavelength (dispersion)

0.0222750

Ā/pix

Cal

CUNIT1

String

Definition of unit of axis 1

Arcsec/time

 

FITSGEN[7]

CUNIT2

String

Definition of unit of axis 2

Arcsec

 

FITSGEN

CUNIT3

String

Definition of unit of axis 3’

Angstrom

 

FITSGEN

CTYPE1

String

Label for axis 1

’Solar-X’

 

FITSGEN

CTYPE2

String

Label for axis 2

’Solar-Y’

 

FITSGEN

CTYPE3

String

Label for axis3

’Wavelength’

 

FITSGEN

INST_ROT

Float

Instrument rotation angle

0.05

Degrees

FITSGEN/

Cal

SAT_ROT

Float

Satellite rotation angle

0.03

Degrees

SC

CROTA1

Float

INST_ROT+SAT_ROT

0.08

Degrees

SC

CROTA2

Float

INST_ROT+SAT_ROT

0.08

Deg

SC

FOVX

Float

Width of Field of view in Solar X

250.34

Deg

SC/Cal

FOVY

Float

Width of field of view in Solar Y

512.0

Deg

SC/CAL?

EISTFLXS

Byte

Sign of EIS translation of XRT flare X coordinate

1

0=pos

1=neg

MDH

EISTXFLX

Integer

EIS translation of XRT flare X

(relative EIS FOV centre)

10

Arcsec

MDH

EISTFLYS

Byte

Sign of EIS translation of XRT flare Y coordinate

0

0=neg.

1=pos.

MDH

EISTXFLY

Integer

EIS translation of XRT flare Y (relative to EIS FOV centre)

20

Arcsec

MDH

EISFLTX

Integer

EIS flare trigger X-coordinate

10

Arcsec

MDH

EISFLTY

Integer

EIS flare trigger Y-coordinate

35

Arcsec

MDH

EISEVTX

Integer

EIS event trigger X-location

1200

FMP[8]

MDH

EISEVTY

Integer

EIS event trigger Y-position

250

CCD Y

MDH

CAL_DC

Integer

Calibration status, Dark current (1=done, 0=not done)

1

 

DA[9]

CAL_FF

Integer

Calibration Status, Flat Field. (1=done, 0=not done)

0

 

DA

CAL_CR

Integer

Calibration Status, Cosmic rays (1=done, 0=not done)

0

 

DA

CAL_WVL

Integer

Calibration status, wavelength

0

 

DA

CAL_ABS

Integer

Calibration status, absolute calibration (photometric) (1=done, 0=not done)

0

 

DA

BITCOMP1

Byte

Bit compression mode

8

 

MDH

IMGCOMP1

Byte

Image compression mode

3

 

MDH

BITC_VER

Integer

Bit compression table number

 

 

MDH

ACHF_TAB

Byte

Huffman AC table number

0

 

MDH

ACHF_VER

Integer

Huff AC table version nr

0

 

MDH

DCHF_TAB

Byte

Huffman DC table

1

 

MDH

DCHF_VER

Integer

Huff DC table version nr

1

 

MDH

QUAN_TAB

Byte

Quantization table

2

 

MDH

QTAB_VER

Integer

Qtab serial nr

3

 

MDH

SAA

String

Satellite in SAA or not

OUT

 

ISACS-PLN

HLZ

String

Satellite in HLZ or not

IN

 

ISACS-PLN

FLFLG

String

XRT flare trigger status (’FLR’ or ’NON’)

’FLR’

 

MDH

XOCB

Byte

On-chip binning X

0

 

MDH

YOCB

Byte

On-chip binning Y

0

 

MDH

RONCCDAR

Byte

CCD-A right read-out-node selected

0=disabled

1=selected

 

MDH

RONCCDAL

Byte

CCD-A left RON selected

 

 

MDH

RONCCDBR

Byte

CCD-B right RON selected

 

 

MDH

RONCCDBL

Byte

CCD-B left RON selected

 

 

MDH

EISAEC

Byte

EIS AEC status

T=enabled

F=disabled

 

MDH

EISEVTR

Byte

EIS event trigger status

T=enabled

F=disabled

 

MDH

EISFLTR

Byte

EIS flare trigger status

T=enabled

F=disabled

 

MDH

ASRCDIR

Byte

Anti Solar Rotation Compensation (ASRC) dir.

0=forward 1=backward

 

MDH

ASRCNR

Byte

ASRC number of steps

2

FMIR

MDH

ASRCSKIP

Byte

ASRC frequency

1

Rasters

MDH

 

 

 

Table 2. Binary Table Extension Keywords

Keyword

Format

Description

Example

Unit

Origin

TFORMn

Integer

Nr of bytes in column(?)

’131072I’

Byte

FITS

TTYPEn

String

Line ID

’Fe IX 195.03’

 

PT

TDIMn

String

Array dimensions for column

’(256,512)’

 

FITSGEN

TUNITn

String

Unit of pixel data

’ADC’

 

FITSGEN

TDESCn

String

Description of data dimensions

’(Wavelength, solar_x, solar_y)’

 

FITS

TCUNIn

String

Descrition of data units

’(Angstrom, arcsec, arcsec)’

 

FITS

TDMINn

Integer

Minimum value of column

0

 

FITSGEN

TDMAXn

Integer

Maximum value of column

16344

 

FITSGEN

TDELTn

String

Axis increments

’(0.02275,1,1)’

TCUNIn

FITS/Cal

TDETXn

Integer

Line window start X-position

1109

Pixel

MDH

TDETXWn

Integer

Line window X-width

32

pixels

MDH

TDETYn

Integer

Line window start Y-position

200

Pixel

MDH

TWAVEn

Float

Principal wavelength

195.32

Ā

PT

TWMINn

Float

(Preliminary) minimum wavelength of line window

195.03

Ā

FITS/Cal[10]

TWMAXn

Float

(Preliminary) maximum wavelength of line window

195.61

Ā

FITS/Cal

TWBNDn

String

Wavelength band

’A’ or ’B’

 

FITSGEN

CCDRONn

Byte

CCD Read Out Node

1

 

MDH

WINHDRn

Byte

Line window header

3

 

MDH

 

 

 

 

 

 

 

 

 

Table 3. Binary Table Extensions

 

  1. Spectral line windows (pixel data). Up to 25 line windows, each has the size [xw, yw, nexp].
  2. T1 – Shutter open time. Long Array of size [nexp]
  3. T2 – Shutter close time. Long array os size  [nexp]
  4. DURMHC – MHC delta exposure time. Long array of size [nexp]
  5. DURSEC – Exposure duration (units of 10ms). Int. Array of size [nexp]
  6. FMIRR – Fine mirror position. Int. Array of size [nexp]
  7. HSL – HSL status. Int. Array of size [nexp]
  8. XRT_FLFL – XRT flare flag received. 0=No flare, 1=flare. Byte array of size [nexp]
  9. XRT_FL_X – XRT flare X-coordinate. Byte array of size [nexp]
  10. XRT_FL_Y – XRT flare y_coordinate. Byte array of size [nexp]
  11. AEC_HEPC – AEC high energy pixel count. Long array of size [nexp]
  12. AEC_LEPC – AEC low energy pixel count. Long array of size [nexp]
  13. MHCG – MHC fine mirror strain gauge output. Int. Array of size [nexp]


[1] Keyword set by the EIS FITS production software

[2] Information retrieved from the As-planned database.

[3] MDH – Mission data header. Contains time of exposures in TI units. To convert to UTC we need time conversion algorithm.

[4] SLIT_NR converted to actual width of slit

[5] Spacecraft data – Comes from separate spacecraft data telemetry packets

[6] This value should be read from an updated archive of calibration data.

[7] Depends on sit-and-stare or scanning. Determind from FMIR_SS

[8] Fine Mirror Position (0-2400 steps)

[9] Updated by the data analysis/Calibration software

[10] A preliminary wavelength scale is obtained from the dispersion. If wavelength calibration is performed later, this value could be updated in higher level FITS files.