MDI Observables: mdi.loi

MDI Resident Archive

MDI Observables

mdi.loi_V

Description

Doppler velocity from either 30-second or 60-second observations in full-disc mode, sampled once per minute at second 00, and summed into each of 180 distinct macropixels defined on the CCD pixels (the “LOI Mask”). The CCD pixel locations for each LOI-Mask macropixel are given in the ancillary data record mdi.macropixmaps_loi[7005]. The data are part of the MDI Structure Program, and are intended to be continuous throughout the mission. All of the data are acquired in linear polarization.

Except during periods of extended loss of contact, there is one record per minute, to assure continuity of certain ancillary data. Records for which there is no image (fill records) have the high-order bit of the QUALITY keyvalue set, and have DATAVALS = 0. Approximately 1% of the records are fill.

Coverage / Duty Cycle

The fraction of possible time intervals containing partial or complete images during each mission phase is as follows:

	<1996.04.20 (Record count only)	1996.04.20 – 1996.05.22	1996.05.23 – 1998.06.24	1998.10.20 – 1998.12.21	1999.02.03 – 2010.09.14	2010.09.14 – 2011.04.12	>2011.04.12 (Record count only)
Partial	0	.969	.991	.904	.975	.900	0
Complete	0	.969	.991	.904	.975	.900	0

Superseded records: 2881 in addition to 7544160 valid

This data series has the highest duty cycle of all the observable series during all phases of the mission except for phases 0 and 6 (pre-mission and post-mission data).

Data Storage

Statistics of SUMS data storage:

SUMS directories: 5236
Average size (MB): 1.008
Minimum size (MB): 1.002
Maximum size (MB): 1.007
Total size (GB): 5.155

DSDS Source Series

sha.dsds[mdi][lev1.4][loi_V]

MDI Product Codes of Contributing Level 0 Data

00000000*

80000000 (only for fill records with no data)

03027005

03417005

03427005

43c27005

43c27105

43c27205

*N.B. These are erroneous, due to a bad default value for missing data records.

Keywords

Prime key(s):

T_REC (time) : 7547041/7547041 valid (7544160 distinct):
    range: 1996.04.20_00:00:00_TAI – 2011.04.11_23:59:00_TAI

Variable key(s):

cparms_sg000 (string) : all 7547041 default: = '' ()
data_bzero (double) : all 7547041 default: = 0 (0)
data_bscale (double) : all 7547041 default: = 1 (1)
T_OBS (time) : 7447331/7547041 valid (7444451 distinct):
    range: 1996.04.20_00:00:00_TAI – 2011.04.11_23:59:00_TAI
    99710 default: = 'NaN' (nan)
DATE__OBS (time) : 7447331/7547041 valid (7396116 distinct):
    range: 1996-04-30T23:59:15Z – -4712.01.01_11:59:28Z
    99710 default: = 'NaN' (nan)
CDELT1 (float) : 7432488/7547041 valid (25284 distinct):
    range: 1.977283 – 1.986302
    114553 default: = 'NaN' (nan)
CDELT2 (float) : 7432488/7547041 valid (25284 distinct):
    range: 1.977283 – 1.986302
    114553 default: = 'NaN' (nan)
CRPIX1 (float) : 7447331/7547041 valid (40616 distinct):
    range: 511.073 – 514.360
    99710 default: = 'NaN' (nan)
CRPIX2 (float) : 7447331/7547041 valid (57283 distinct):
    range: 510.261 – 514.101
    99710 default: = 'NaN' (nan)
CROTA2 (float) : 7447331/7547041 valid (82795 distinct):
    range: -180.0 – 180.0
    99710 default: = 'NaN' (nan)
CAR_ROT (int) : 7531201/7547041 valid (198 distinct):
    range: 1908 – 2108
    15840 default: = -2147483648 (-2147483648)
CRLN_OBS (float) : 7547041/7547041 valid (6454479 distinct):
    range: 0.000 – 360.000
CRLT_OBS (float) : 7547041/7547041 valid (6516283 distinct):
    range: -7.3032 – 7.2937
DSUN_OBS (double) : 7547041/7547041 valid (7543759 distinct):
    range: 145493489596.19 – 150819330908.69
OBS_VR (double) : 7547041/7547041 valid (7544158 distinct):
    range: -588.730673 – 587.618351
OBS_VW (double) : 7547041/7547041 valid (7543931 distinct):
    range: 28556.637569 – 30079.387972
OBS_VN (double) : 7547041/7547041 valid (7544146 distinct):
    range: -3827.567226 – 3722.207934
RSUN_OBS (double) : 7531201/7547041 valid (7528212 distinct):
    range: 951.872773 – 986.716678
    15840 default: = 'NaN' (nan)
R_SUN (float) : 7432488/7547041 valid (641105 distinct):
    range: 479.279 – 498.872
    114553 default: = 'NaN' (nan)
X0 (float) : 7447331/7547041 valid (56940 distinct):
    range: 510.073 – 513.360
    99710 default: = 'NaN' (nan)
Y0 (float) : 7447331/7547041 valid (73667 distinct):
    range: 509.261 – 513.101
    99710 default: = 'NaN' (nan)
EARTH_DT (float) : 7432488/7547041 valid (2808368 distinct):
    range: 4.095383 – 5.654347
    114553 default: = 'NaN' (nan)
DATAVALS (int) : 7547041/7547041 valid (7 distinct):
    range: 0 – 180
MISSVALS (int) : 7447331/7547041 valid (7 distinct):
    range: 0 – 180
    99710 default: = -2147483648 (-2147483648)
DATAMIN (float) : 7432488/7547041 valid (4252291 distinct):
    range: -15951.7 – 340282346999999999997267433466808500224.0
    114553 default: = 'NaN' (nan)
DATAMAX (float) : 7432488/7547041 valid (5084221 distinct):
    range: -340282346999999999997267433466808500224.0 – 19182.0
    114553 default: = 'NaN' (nan)
DATAMEDN (float) : 7440959/7547041 valid (6878589 distinct):
    range: -5913.000 – 2750.330
    106082 default: = 'NaN' (nan)
DATAMEAN (float) : 7447331/7547041 valid (6871478 distinct):
    range: -5689.040 – 11594.110
    99710 default: = 'NaN' (nan)
DATARMS (float) : 7447331/7547041 valid (2296180 distinct):
    range: 0.000000 – 16399.970700
    99710 default: = 'NaN' (nan)
DATASKEW (float) : 7447331/7547041 valid (6428275 distinct):
    range: -3.543 – 3.370
    99710 default: = 'NaN' (nan)
DATAKURT (float) : 7447331/7547041 valid (2826967 distinct):
    range: -1.477 – 18.883
    99710 default: = 'NaN' (nan)
DPC (int) : 7533512/7547041 valid (7 distinct):
    range: ffffffff80000000 – 43c27205
    13529 default: = 0 (00000000)
INTERVAL (float) : 7398850/7547041 valid (2 distinct):
    60.00
    30.00
    148191 default: = 'NaN' (nan)
BLD_VERS (string) : 7447331/7547041 valid (1 distinct):
    V8R4X
    99710 default: = '' ()
DATE (time) : 7547041/7547041 valid (7449692 distinct):
    range: 2014-04-16T21:15Z – 2014-04-29T01:44Z
RUNTIME (time) : 7432488/7547041 valid (5175 distinct):
    range: 1997.06.11_22:34_UTC – 2011.05.23_20:34_UTC
    114553 default: = 'NaN' (nan)
SOURCE (string) : 7447331/7547041 valid (7423414 distinct):
    range: prog:mdi,level:lev0,series:43c27005_01h[29521] – prog:mdi,level:lev1[],series:03417005_01d[]:sel[9]
    99710 default: = '' ()
BLDVER15 (string) : 7431050/7547041 valid (46 distinct):
    range: -40800 – 60100
    115991 default: = '' ()
CALTBLS (string) : 7424208/7547041 valid (4 distinct):
    mdi.caltables_doppler[fd_tune_2]
    mdi.caltables_doppler[fd_tune_1]
    mdi.caltables_doppler[fd_tune_5]
    mdi.caltables_doppler[fd_tune_6]
    122833 default: = '' ()
TBLXYUPD (time) : 7432488/7547041 valid (1111 distinct):
    range: 1997.06.03_20:05:45_UTC – 2011.05.23_19:05:04_UTC
    114553 default: = 'NaN' (nan)
XY_FROM (string) : 7432488/7547041 valid (2 distinct):
    ????
    114553 default: = '' ()
QUALITY (int) : 7547041/7547041 valid (28 distinct):
    range: ffffffff80000000 – 000002fc
XY_QUAL (int) : 7398306/7547041 valid (1 distinct):
    0
    148735 default: = -2147483648 (-2147483648)
HISTORY (string) : all 7547041 default: = '' ()

Constant key(s):

CAMERA (string) : MDI
CONTENT (string) : MDI LOI Doppler Velocity
CRVAL1 (float) : 0.000
CRVAL2 (float) : 0.000
CTYPE1 (string) : HPLN-TAN
CTYPE2 (string) : HPLT-TAN
CUNIT1 (string) : arcsec
CUNIT2 (string) : arcsec
WCSAXES (int) : 2
WCSNAME (string) : Helioprojective-cartesian
BUNIT (string) : m/s
CADENCE (float) : 60.0
INSTRUME (string) : MDI
TELESCOP (string) : SOHO
WAVELNTH (int) : 6768
ORIGIN (string) : SOI Science Support Center
POLSTATE (string) : LP
ROLL_TBL (string) : mdi.roll_table
RSUN_REF (double) : 696000000
T_REC_epoch (time) : 1977.01.01_00:33:12_TAI
T_REC_step (float) : 60.0
COMMENT (string) : Data from the Solar Oscillations Investigation / Michelson Doppler Imager (SOI/MDI) on the Solar and Heliospheric Observatory (SOHO)
MACROMAP (string) : mdi.macropixmaps_loi[7005]

Special Notes

There are 195 records with clearly erroneous values of DATAMAX.

this page last modified 9 Jul 2015, 11:31-0700