--- header unit 0: primary ---
SIMPLE = T / file does conform to FITS standard
BITPIX = 16 / number of bits per data pixel
NAXIS = 0 / number of data axes
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
CHECKSUM = '3dA64ZA33bA33ZA3' / HDU checksum updated 2025-07-24T11:00:49
DATASUM = '         0' / data unit checksum updated 2025-07-24T11:00:49
--- header unit 1: binary table ---
XTENSION = 'BINTABLE' / binary table extension
BITPIX = 8 / 8-bit bytes
NAXIS = 2 / 2-dimensional binary table
NAXIS1 = 8 / width of table in bytes
NAXIS2 = 2048 / number of rows in table
PCOUNT = 2886287 / size of special data area
GCOUNT = 1 / one data group (required keyword)
TFIELDS = 1 / number of fields in each row
TTYPE1 = 'COMPRESSED_DATA' / label for field 1
TFORM1 = '1PB(1815)' / data format of field: variable length array
ZIMAGE = T / extension contains compressed image
ZTILE1 = 2048 / size of tiles to be compressed
ZTILE2 = 1 / size of tiles to be compressed
ZCMPTYPE = 'RICE_1' / compression algorithm
ZNAME1 = 'BLOCKSIZE' / compression block size
ZVAL1 = 32 / pixels per block
ZNAME2 = 'BYTEPIX' / bytes per pixel (1, 2, 4, or 8)
ZVAL2 = 2 / bytes per pixel (1, 2, 4, or 8)
EXTNAME = 'COMPRESSED_IMAGE'
ZSIMPLE = T / Fits standard
ZBITPIX = 16 / Bits per pixel
ZNAXIS = 2 / Number of axes
ZNAXIS1 = 2048 / Axis length
ZNAXIS2 = 2048 / Axis length
ZEXTEND = T / File may contain extensions
GONGKEY1 = '--------- Gong Keywords Section 1: Solarsoft ----------------'
ORIGIN = 'National Solar Observatory -- GONG' / FITS file originator
OBS-SITE = 'NSO/GONG NETWORK' / Instrument Site location
TELESCOP = 'NSO-GONG' / NSO/GONG Network
OBS-URL = 'http://gong.nso.edu' / The GONG website
DATE = '2025-07-24T11:00:43' / Date FITS file was generated
DATE-OBS = '2025-07-24T11:00:11' / Observation start date and time (UTC)
TIME-OBS = '11:00:12' / Observation start time (UTC)
WAVELNTH = 6562.808 / [A] exact wavelength of obs
WCSNAME = 'Helioprojective-cartesian' / WCS system name
CTYPE1 = 'HPLN-TAN' / Axis 1 gives helioprojective westward angle
CTYPE2 = 'HPLT-TAN' / Axis 2 gives helioprojective northward angle
CRPIX1 = 1024.5 / Pixel corresponding to Sun's center on axis 1
CRPIX2 = 1024.5 / Pixel corresponding to Sun's center on axis 2
CRVAL1 = 0.00000 / Helioprojective westward angle at CRPIX1
CRVAL2 = 0.00000 / Helioprojective northward angle at CRPIX2
CDELT1 = 1.049645388059 / Angular change per pixel along axis 1
CDELT2 = 1.049645388059 / Angular change per pixel along axis 2
CUNIT1 = 'arcsec' / Units of CRVAL1 and CDELT1
CUNIT2 = 'arcsec' / Units of CRVAL2 and CDELT2
CROTA1 = 0.0 / [deg] Counter-clockwise rotation of axis 1
CROTA2 = 0.0 / [deg] Counter-clockwise rotation of axis 2
TIMESYS = 'UTC' / Time Scale specification
SOLAR_R = 944.680849252939 / [arcsec] solar semi-diameter
EPH_RA = 2.165294431 / Right Acension (radians)
EPH_DEC = 0.344908015 / Declination (radians)
IMTYPE = 'H-ALPHA'
IMGMN01 = 1787.438720703 / Image mean
IMGRMS01 = 1427.318237305 / Image RMS (Standard Deviation)
IMGSKW01 = -0.343189240 / Image skewness
IMGMIN01 = -2 / Image Min
IMGMAX01 = 4576 / Image Max
IMGADV01 = 1339.832885742 / Image Average Deviation
IMGVAR01 = 2037237.250000000 / Image Variance
IMGKUR01 = -1.780558586 / Image Kurtosis
GONGKEY2 = '--------- Gong Keywords Section 2: Raw ----------------'
IRAF-TLM = '2025-07-24T11:00:43' / Time of last modification
VERSION = '5.25' / H-Alpha Software Version
SITENAME = 'TD'
SITE = 'TD'
J2000 = 9335.958614968 / Julian 2000 date
LST = 1.588490341 / Local apparent sidereal time (radians)
ZENITH = 0.545357703 / Zenith distance (radians)
RA = 2.165294431 / Right ascension (radians)
DEC = 0.344908015 / Declination (radians)
PA = 0.136101662 / Solar position angle (radians)
HA = -0.57680409 / Hour angle (radians)
BETA = -0.262303357 / Parallactic angle (radians)
RADIUS = 900 / [pixel] solar semi-diameter
EROLL = -0.540523049 / Ephemeris roll angle (radians)
EPITCH = -0.076348731 / Ephemeris pitch angle (radians)
EROTATOR = -0.338121593 / Ephemeris rotator angle (radians)
ROLL = -0.540118368 / Roll position (radians)
PITCH = -0.077884147 / Pitch position (radians)
ROTATOR = -0.338125587 / Rotator position (radians)
SMEAR = 0.015 / Camera smear correction parameter
CAMERA = 'DVC 4000M-CL' / Camera Model
CAMERASN = 3348 / Camera serial number
SHARPNSS = 0.00934802676614539 / Image sharpness quantifier (0=Worst,1=Best)
SKYBRITE = 75 / Average of square regions in four corners
ECLIPSE = 0 / Eclipse Flag (1=TRUE, 0=FALSE)
HASERNUM = 'QPE110109DH' / H-Alpha filter Serial Number
HAVERSN = 1.6 / H-Alpha filter Firmware Version
HAERRCOD = 0 / H-Alpha filter Error Code (0=Good)
HAONBAND = 1 / Filter On-Band status (0=Controlling,1=Setpt)
HACNTRWL = 6562.8 / H-Alpha filter current Center Wavelength
HAWNGSHF = 0.0 / H-Alpha filter Wavelength Shift setting
HAHT1PWM = 23.85 / Filter Heater 1 Power Module setting (0-100%)
HALMTPWM = 1023 / Filter Power Modules Limit setting (<=1023)
HATEMP1 = 132.0 / Filter Heater 1 current Temperature (F)
HAVOLTS = 11.04 / H-Alpha filter Current Voltage
HAPOTPOS = 0 / Filter calibration Pot Position (0=Normal)
HATEMP2 = 149.93 / Filter Heater 2 current Temperature (F)
HAHT2PWM = 51.61 / Filter Heater 2 Power Module setting (0-100%)
HATURNON = 116 / H-Alpha filter Turn On count
HA-AGE = 8261488 / H-Alpha filter power-on Age in minutes
RMS_XROI = 960 / X starting position of RMS ROI box (GONG)
RMS_YROI = 960 / Y starting position of RMS ROI box (GONG)
RMS_SIZE = 181 / Axis length of RMS ROI box (GONG)
RMS = 3133.37422673047 / RMS of pixel values in RMS ROI box (GONG)
GTCLMBXC = 1026.57 / Saved getctr values
GTCLMBYC = 1005.64
GTCLMBRA = 879.08
GTCLMBSX = 1.536
GTCLMBSY = 0.968
GTCLMBSR = 0.764
GTC_FLAG = 4
GEOLMBXC = 1027.4 / Saved geom values
GEOLMBYC = 1005.442
GEOLMBMA = 879.205
GEOLMBMI = 878.894
GEOLMBAN = -69.188
GONGKEY3 = '--------- Gong Keywords Section 3: Processing History ------------'
HALKEY10 = 'H Alpha Site Paramters'
HA-OBJ = -33.0484399628841 / [arcdeg] sun's local hour angle (+=West)
DEC-OBJ = 19.7617735797349 / [arcdeg] sun's declination (+=North)
AZ-OBJ = 81.5420066229456 / [arcdeg] sun's azimuth
EL-OBJ = 58.753305293151 / [arcdeg] sun's elevation
ETA-OBJ = -15.0288753082133 / [arcdeg] sun's parallactic angle (+=North)
SOLAR-P = 7.79315607431793 / [arcdeg] solar P angle
SOLAR-B0 = 5.18110171752942 / [arcdeg] solar B0 angle
SOLAR-L0 = 257.527032154765 / [arcdeg] Carrington Longitude
SOLAR-SR = 2300 / Synodic Rotation Number
SOLAR-R = 944.680849252939 / [arcsec] solar semi-diameter
SITE-LON = -16.5119444179771 / [arcdeg] Site's longitude (+=East)
SITE-LAT = 28.3008333490995 / [arcdeg] Site's latitude (+=North)
CCD-ROT = -19.3731690804835 / [arcdeg] CCD camera angle
BC-METHD = 'radial' / Calibration method
BC-SETPT = 3200.0 / [a/d cts] ROI setpoint (GONG)
BC-VALUE = 3185.0 / [a/d cts] central intensity (GONG)
BC-SCALE = 1.00470957613815 / scale factor applied (GONG)
BC-TILT1 = 0.0 / plane tilt removed:
BC-TILT2 = 0.0 / plane = t[1] + t[2]*x + t[3]*y
BC-TILT3 = 0.0
DISKPRO1 = 0.0 / Disk Profile Coefs.: p[]
DISKPRO2 = 0.0 / phi = 1 - cosT*ln(1 + 1/cosT)
DISKPRO3 = 0.0 / profile = p[1] + p[2]*cosT + p[3]*phi
HALKEY11 = 'HAL Processing History'
GHISTSEQ = 9
GHIST000 = 'Task GEOM (25/07/24 11:00:41, V2.14)'
GHIST001 = 'edge_type=gradient,opt_type=ols,kern_width=3,usehdr=no,auto_type'
GHIST002 = '=none,xcenter=1026.57,ycenter=1005.64,majorax=879.08,minorax=879'
GHIST003 = '.08,angle=0.,nfit=5,width=30.,pcfit=1.,pixlenx=1.,pixleny=1.,fco'
GHIST004 = 'l=1,lcol=2048,frow=1,lrow=2048,niter=1,finterp_fact=0,output=no,'
GHIST005 = 'resout=no,lmbout=no,updhdr=yes,err_action=skip'
GHIST006 = 'Task LMBCOR (25/07/24 11:00:42, V2.14)'
GHIST007 = 'sw_dim=yes,n1_ot=0,n2_ot=0,sw_pix=no,pxlx_ot=1.,pxly_ot=1.,sw_li'
GHIST008 = 'mb=no,xcenter=1024.,ycenter=1024.,minorax=900.,majorax=900.,angl'
GHIST009 = 'e=0.,pcr=115.,rot=-14.8732,interp=4'
FNDLMBXC = 1024.0
FNDLMBYC = 1024.0
FNDLMBMI = 900.0
FNDLMBMA = 900.0
FNDLMBAN = 0.0
PIXLENX = 1.0
PIXLENY = 1.0
OFFSET = 4.5 / Per site camera offset angle (degrees,+=CCW)
COMMENT This GONG product is produced by the H Alpha Laminator (HAL).
COMMENT See http://gong.nso.edu for more information about GONG.
TFACTOR = 575 / Centering alg limb threshold scale factor
THRSHCLC = 511 / Calculated refraction corrected threshold
LIMBPTCT = 4 / Number of centering algorithm limb points
LIMBMEDN = 1183 / Median brightness of limb threshold values
FIT-X0 = 1028.0 / [pix] raw image ellipse x-center
FIT-Y0 = 1003.0 / [pix] raw image ellipse y-center
PLATFORM = 'Linux ncs-gong-proc3-lx'
FITSWASH = '$RCSfile: halpha_header.kw,v $ $Revision: 1.15 $ $Date: 2011/06/29 1'
CHECKSUM = '73DA829972CA7299' / HDU checksum updated 2025-07-24T11:00:49
DATASUM = '3887948377' / data unit checksum updated 2025-07-24T11:00:49