--- 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 = '5aE35YB25aB25YB2' / HDU checksum updated 2025-07-20T08:01:18
DATASUM = '         0' / data unit checksum updated 2025-07-20T08:01:18
--- 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 = 2876381 / 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(1805)' / 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 = '2025-07-20T08:01:13' / Date FITS file was generated
DATE-OBS = '2025-07-20T08:00:42' / Observation start date and time (UTC)
TIME-OBS = '16:00:43' / 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 = 1.049298404818 / Angular change per pixel along axis 1
CDELT2 = 1.049298404818 / 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 = 944.368564336281 / [arcsec] solar semi-diameter
EPH_RA = 2.093713308 / Right Acension (radians)
EPH_DEC = 0.359402383 / Declination (radians)
IMTYPE = 'H-ALPHA'
IMGMN01 = 1796.847412109 / Image mean
IMGRMS01 = 1441.811401367 / Image RMS (Standard Deviation)
IMGSKW01 = -0.347692460 / Image skewness
IMGMIN01 = -2 / Image Min
IMGMAX01 = 4563 / Image Max
IMGADV01 = 1402.519287109 / Image Average Deviation
IMGVAR01 = 2078820 / Image Variance
IMGKUR01 = -1.789883256 / Image Kurtosis
GONGKEY2 = '--------- Gong Keywords Section 2: Raw ----------------'
IRAF-TLM = '2025-07-20T08:01:13' / Time of last modification
VERSION = '5.23' / H-Alpha Software Version
SITENAME = 'LE'
SITE = 'LE'
J2000 = 9331.833841164 / Julian 2000 date
LST = 3.013211438 / Local apparent sidereal time (radians)
ZENITH = 1.166950464 / Zenith distance (radians)
RA = 2.093713308 / Right ascension (radians)
DEC = 0.359402383 / Declination (radians)
PA = 0.10541047 / Solar position angle (radians)
HA = 0.919498129 / Hour angle (radians)
BETA = -0.365438959 / Parallactic angle (radians)
RADIUS = 900 / [pixel] solar semi-diameter
EROLL = -1.085020596 / Ephemeris roll angle (radians)
EPITCH = -0.570480854 / Ephemeris pitch angle (radians)
EROTATOR = -0.255083188 / Ephemeris rotator angle (radians)
ROLL = -1.089238221 / Roll position (radians)
PITCH = -0.566811232 / Pitch position (radians)
ROTATOR = -0.255077571 / Rotator position (radians)
SMEAR = 0.014 / Camera smear correction parameter
CAMERA = 'DVC 4000M-CL' / Camera Model
CAMERASN = 3340 / Camera serial number
SHARPNSS = 0.00940011669017071 / Image sharpness quantifier (0=Worst,1=Best)
SKYBRITE = 33 / Average of square regions in four corners
ECLIPSE = 0 / Eclipse Flag (1=TRUE, 0=FALSE)
HASERNUM = 'QPE101209' / H-Alpha filter Serial Number
HAVERSN = 0.0 / H-Alpha filter Firmware Version
HAERRCOD = 0 / H-Alpha filter Error Code (0=Good)
HAONBAND = 0 / Filter On-Band status (0=Controlling,1=Setpt)
HACNTRWL = 0.0 / H-Alpha filter current Center Wavelength
HAWNGSHF = 0.0 / H-Alpha filter Wavelength Shift setting
HAHT1PWM = 0.0 / Filter Heater 1 Power Module setting (0-100%)
HALMTPWM = 0 / Filter Power Modules Limit setting (<=1023)
HATEMP1 = 0.0 / Filter Heater 1 current Temperature (F)
HAVOLTS = 0.0 / H-Alpha filter Current Voltage
HAPOTPOS = 0 / Filter calibration Pot Position (0=Normal)
HATEMP2 = 0.0 / Filter Heater 2 current Temperature (F)
HAHT2PWM = 0.0 / Filter Heater 2 Power Module setting (0-100%)
HATURNON = 220 / H-Alpha filter Turn On count
HA-AGE = 3450130 / 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 = 3168.26105789618 / RMS of pixel values in RMS ROI box (GONG)
GTCLMBXC = 1016.65 / Saved getctr values
GTCLMBYC = 1034.82
GTCLMBRA = 871.01
GTCLMBSX = 14.569
GTCLMBSY = 1.117
GTCLMBSR = 0.352
GTC_FLAG = 4
GEOLMBXC = 1012.205 / Saved geom values
GEOLMBYC = 1033.835
GEOLMBMA = 871.404
GEOLMBMI = 869.99
GEOLMBAN = 5.072
GONGKEY3 = '--------- Gong Keywords Section 3: Processing History ------------'
HALKEY10 = 'H Alpha Site Paramters'
HA-OBJ = 52.6833620618757 / [arcdeg] sun's local hour angle (+=West)
DEC-OBJ = 20.5922396928444 / [arcdeg] sun's declination (+=North)
AZ-OBJ = 305.975886588431 / [arcdeg] sun's azimuth
EL-OBJ = 23.1386635119669 / [arcdeg] sun's elevation
ETA-OBJ = -20.9381100203543 / [arcdeg] sun's parallactic angle (+=North)
SOLAR-P = 6.03501685864279 / [arcdeg] solar P angle
SOLAR-B0 = 4.82064734519658 / [arcdeg] solar B0 angle
SOLAR-L0 = 312.096293819603 / [arcdeg] Carrington Longitude
SOLAR-SR = 2300 / Synodic Rotation Number
SOLAR-R = 944.368564336281 / [arcsec] solar semi-diameter
SITE-LON = 114.10271997243 / [arcdeg] Site's longitude (+=East)
SITE-LAT = -22.2185000083445 / [arcdeg] Site's latitude (+=North)
CCD-ROT = -14.6148682667486 / [arcdeg] CCD camera angle
BC-METHD = 'radial' / Calibration method
BC-SETPT = 3200.0 / [a/d cts] ROI setpoint (GONG)
BC-VALUE = 3171.0 / [a/d cts] central intensity (GONG)
BC-SCALE = 1.00914538000631 / 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 (25/07/20 08:01:11, V2.14)'
GHIST001 = 'edge_type=gradient,opt_type=ols,kern_width=3,usehdr=no,auto_type'
GHIST002 = '=none,xcenter=1016.65,ycenter=1034.82,majorax=871.01,minorax=871'
GHIST003 = '.01,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 (25/07/20 08:01:12, 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=-10.8149,interp=4'
FNDLMBXC = 1024.0
FNDLMBYC = 1024.0
FNDLMBMI = 900.0
FNDLMBMA = 900.0
FNDLMBAN = 0.0
PIXLENX = 1.0
PIXLENY = 1.0
OFFSET = 3.8 / 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 = 445 / Calculated refraction corrected threshold
LIMBPTCT = 3 / Number of centering algorithm limb points
LIMBMEDN = 1291 / Median brightness of limb threshold values
FIT-X0 = 1016.0 / [pix] raw image ellipse x-center
FIT-Y0 = 1036.0 / [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 = 'UXIIUVGHUVGHUVGH' / HDU checksum updated 2025-07-20T08:01:18
DATASUM = '3422547128' / data unit checksum updated 2025-07-20T08:01:18