Differences between revisions 1 and 15 (spanning 14 versions)

HMI Magnetic Field Products

Synoptic Maps Available

HMI synoptic maps are available. They are computed from the 720s line-of-sight magnetic field measurements and come in 3600*1440 and 720*360 sizes.

Standard HMI Photospheric Field Carrington Synoptic Maps
Line of sight synoptic map	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Ml_720s hmi.Synoptic_Ml_720s]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Ml_720s_small hmi.Synoptic_Ml_720s_small]
Assumed Radial component of LoS map	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Mr_720s hmi.Synoptic_Mr_720s]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Mr_720s_small hmi.Synoptic_Mr_720s_small]
DailySynopticMaps
Daily Update LoS Synoptic Map	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s hmi.Mldailysynframe_720s]	Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s_small hmi.Mldailysynframe_720s_small]
Daily Update Radial Synoptic Map	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s hmi.Mrdailysynframe_720s]	Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s_small hmi.Mrdailysynframe_720s_small]
Daily NRT Synoptic Maps
Daily Update NRT Los Synoptic Map	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s_nrt hmi.Mldailysynframe_720s_nrt]	Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s_nrt_small hmi.Mldailysynframe_720s_nrt_small]
Daily Update NRT Radial Synoptic Map	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s_nrt hmi.Mrdailysynframe_720s_nrt]	Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s_nrt_small hmi.Mrdailysynframe_720s_nrt_small]

General Description of HMI Magnetic Field Data Products

The line-of-sight magnetic field, hmi.M, is computed from the difference of the Doppler velocities observed in two circular polarizations, as was done for MDI. The filtergrams are obtained by the Doppler camera on HMI. The basic line-of-sight observing cadence is 45 seconds.

The vector magnetic field, hmi.B, is computed from Stokes parameters derived from an independent set of polarized filtergrams. The basic vector field observing cadence is currently 135 seconds and uses HMI's Magnetic camera. Most analysis is done with 720s averages.

The possibility of combining filtergrams from the two cameras will be explored.

Vector field data products include the following quantities (and at least 23 others, including uncertainties)

|B| - total flux
Inclination (gamma) to the line of sight
Azimuth (phi) relative to 'up' on the CCD
Magnetic line-of sight velocity

Data will be exported in a variety of coordinate systems: [Bx,By,Bz], [B_total,gamma,phi], and [Br,Btheta,Bphi]

More detail is provided at VectorMagneticField and LineofsightMagneticField and SpaceWeatherProducts.

Line of sight Magnetograms	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.M_720s hmi.M_720s]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.M_45s hmi.M_45s]
Stokes Parameters	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.S_720s hmi.S_720s]
VFISV Inversion - ME	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_fd10 hmi.ME_720s_fd10]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332 hmi.ME_720s_e15w1332]
Disambiguated Vector B	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.B_720s_e15w1332_cutout hmi.B_720s_e15w1332_cutout]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.B_720s_e15w1332_CEA hmi.B_720s_e15w1332_CEA]

HMI Active Region Patches

A HARP (short for HMI Active Region Patch) is an enduring, coherent magnetic structure at the size scale of a solar active region. The primary purpose of the HARP data series is to provide the practical geometric information needed to follow an evolving region as it crosses the solar disk. A HARP is initially identified automatically in a sequence of HMI line-of-sight magnetograms. HARPs are typically observed over several days (possibly as long as a disk passage) and tracked from one image to the next. At each time step, the rectangular HARP bounding box is provided and a BITMAP that characterizes the pixels of the HARP is recorded. The bounding box encloses the maximum heliographic extent of the region during its life time. The BITMAP indicates which pixels in the box are part of the HMI active region patch and can be applied to an HMI image. Keywords provide summary information about the patch (e.g. the total line-of-sight magnetic flux) as well as geometric and heliographic specifics.

The HARP information is being used to determine regions of interest for vector field inversion processing, both for past data (see hmi.ME_720s_fd10_HARP) and for near real time processing (hmi.ME_720s_fd10_HARP_nrt). Near real time HARPs (hmi.Mharp_720s_nrt) are a little different than definitive HARPs because the entire history or each region is not known; NRT and definitive HARP numbers differ.

See ["HARPDataSeries"] for details.

HARP Data Series	Definitive	NRT
Line of Sight	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mharp_720s hmi.HMarp_720s]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mharp_720s_nrt hmi.HMarp_720s_nrt]
Vector - ME	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_fd10_HARP hmi.ME_720s_fd10_HARP]	[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_fd10_HARP_nrt hmi.ME_720s_fd10_HARP_nrt]

Selected HMI Science Data Products

Standard Pipeline

45-second - full disk
- Blos (hmi.M_45s)
- Vlos (hmi.V_45s)
- Continuum intensity (hmi.Ic_45s), line depth (hmi.Ld_45s), and line width (hmi.Lw_45s)
12 - minute
- Line-of-sight magnetic field (hmi.M_720s)
- Doppler velocity (hmi.V_720s)
- Continuum intensity (hmi.Ic_720s), line depth (hmi.Ld_720s), and line width (hmi.Lw_720)
- Stokes vector (hmi.S_720s), the IQUV values at each of 5 wavelengths
- Inverted Vector Field (hmi.ME_720s) VFISV - Milne-Eddington Inversion (not yet released)
- Disambiguated Vector Field (patches), hmi.Bharp_720s (not yet released)
3 (TBD) - hour
- Disambiguated B on full disk, hmi.B (not yet released)

On Demand

3-second filtergrams
3-minute vector B on patches
6-minute disambiguated patches
12-minute full-disk disambiguated vector field

On Request

135-second disambiguated patches
135-second Stokes Vectors
Anything else

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-  ⇤ ← Revision 1 as of 2009-04-03 16:26:48 → 
  Size: 1612
  Editor: pool-71-105-100-82
  Comment:
+   ← Revision 15 as of 2012-07-27 05:06:08 → ⇥
  Size: 6888
  Editor: l4-m0
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-== HMI Magnetic Field Products ==
+= HMI Magnetic Field Products =
 Line 3:
-Line-of-sight magnetic field will be computed from Doppler Velocity in two polarizations, as is done for MDI.
+=== Synoptic Maps Available ===
 . HMI synoptic maps are available. They are computed from the 720s line-of-sight magnetic field measurements and come in 3600*1440 and 720*360 sizes.
-Line 5:
+Line 6:
-Vector Field will be computed from Stokes parameters derived from an independent set of polarized filtergrams.

After launch the possibility of combining the two cameras will be explored.

The basic line-of-sight cadence is 45 seconds.  The basic vector field cadence in 90 seconds.

Vector field data products will be the following quantities and uncertainties on each
 . |B| - total flux
 . Filling factor
 . Inclination (gamma) to the line of sight
 . Azimuth (relative to solar north
 . Magnetic line-of sight velocity
+ ||||||Standard HMI Photospheric Field Carrington Synoptic Maps ||
 || Line of sight synoptic map || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Ml_720s hmi.Synoptic_Ml_720s] || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Ml_720s_small hmi.Synoptic_Ml_720s_small] ||
 || Assumed Radial component of LoS map || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Mr_720s hmi.Synoptic_Mr_720s] || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Synoptic_Mr_720s_small hmi.Synoptic_Mr_720s_small] ||
 ||||||DailySynopticMaps||
 || Daily Update LoS Synoptic Map || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s hmi.Mldailysynframe_720s] || Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s_small hmi.Mldailysynframe_720s_small] ||
 || Daily Update Radial Synoptic Map || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s hmi.Mrdailysynframe_720s] || Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s_small hmi.Mrdailysynframe_720s_small] ||
 ||||||Daily NRT Synoptic Maps||
 || Daily Update NRT Los Synoptic Map || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s_nrt hmi.Mldailysynframe_720s_nrt] || Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mldailysynframe_720s_nrt_small hmi.Mldailysynframe_720s_nrt_small] ||
 || Daily Update NRT Radial Synoptic Map || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s_nrt hmi.Mrdailysynframe_720s_nrt] || Coming soon: [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mrdailysynframe_720s_nrt_small hmi.Mrdailysynframe_720s_nrt_small] ||
-Line 20:
+Line 18:
-===== Module Inputs =====
 . List inputs here
+=== General Description of HMI Magnetic Field Data Products ===
-Line 23:
+Line 20:
-===== Module Outputs =====
 . List outputs here
+The line-of-sight magnetic field, hmi.M, is computed from the difference of the Doppler velocities observed in two circular polarizations, as was done for MDI. The filtergrams are obtained by the Doppler camera on HMI. The basic line-of-sight observing cadence is 45 seconds.
-Line 26:
+Line 22:
-===== Cadence =====
 . Indicate nominal cadence on which module is run
+The vector magnetic field, hmi.B, is computed from Stokes parameters derived from an independent set of polarized filtergrams.
The basic vector field observing cadence is currently 135 seconds and uses HMI's Magnetic camera. Most analysis is done with 720s averages.
-Line 29:
+Line 25:
-===== Archive =====
 . Indicate if/when products are archived
+The possibility of combining filtergrams from the two cameras will be explored.
-Line 32:
+Line 27:
-===== Options =====
 . Indicate if there are any options when running the code
+Vector field data products include the following quantities (and at least 23 others, including uncertainties)
 . |B| - total flux
 . Inclination (gamma) to the line of sight
 . Azimuth (phi) relative to 'up' on the CCD
 . Magnetic line-of sight velocity
-Line 35:
+Line 33:
-===== Overall Status of Module =====
 . Indicate estimate of percentage complete for the module
+Data will be exported in a variety of coordinate systems: [''Bx,By,Bz''], [''B_total,gamma,phi''], and [''Br,Btheta,Bphi'']
-Line 38:
+Line 35:
-===== Status of Code =====
 . Name heritage or percent complete for Basic Code
+More detail is provided at VectorMagneticField and LineofsightMagneticField and SpaceWeatherProducts.
-Line 41:
+Line 37:
-===== Status of DRMS module =====
 . Indicate status of DRMS module version of module
+ || Line of sight Magnetograms || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.M_720s hmi.M_720s] || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.M_45s hmi.M_45s] ||
 || Stokes Parameters || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.S_720s hmi.S_720s] || ||
 || VFISV Inversion - ME || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_fd10 hmi.ME_720s_fd10] || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332 hmi.ME_720s_e15w1332] ||
 || Disambiguated Vector B || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.B_720s_e15w1332_cutout hmi.B_720s_e15w1332_cutout] || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.B_720s_e15w1332_CEA hmi.B_720s_e15w1332_CEA] ||
-Line 44:
+Line 42:
-===== Issues needing resolution =====
+=== HMI Active Region Patches ===
-Line 46:
+Line 44:
-  * List issues that still need to be resolved
  * Describe as many as you like
+A HARP (short for HMI Active Region Patch) is an enduring, coherent magnetic structure at the size scale of a solar active region. The primary purpose of the HARP data series is to provide the practical geometric information needed to follow an evolving region as it crosses the solar disk. A HARP is initially identified automatically in a sequence of HMI line-of-sight magnetograms. HARPs are typically observed over several days (possibly as long as a disk passage) and tracked from one image to the next. At each time step, the rectangular HARP bounding box is provided and a BITMAP that characterizes the pixels of the HARP is recorded. The bounding box encloses the maximum heliographic extent of the region during its life time. The BITMAP indicates which pixels in the box are part of the HMI active region patch and can be applied to an HMI image. Keywords provide summary information about the patch (e.g. the total line-of-sight magnetic flux) as well as geometric and heliographic specifics.
-Line 49:
+Line 46:
-===== Responsible scientist =====
 . Give name of local coordinator for development of this module
+The HARP information is being used to determine regions of interest for vector field inversion processing, both for past data (see hmi.ME_720s_fd10_HARP) and for near real time processing (hmi.ME_720s_fd10_HARP_nrt). Near real time HARPs (hmi.Mharp_720s_nrt) are a little different than definitive HARPs because the entire history or each region is not known; NRT and definitive HARP numbers differ.
-Line 52:
+Line 48:
-===== Remarks =====
+See ["HARPDataSeries"] for details.
-Line 54:
+Line 50:
+ || HARP Data Series || Definitive || NRT ||
 || Line of Sight || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mharp_720s hmi.HMarp_720s] ||[http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.Mharp_720s_nrt hmi.HMarp_720s_nrt] ||
 || Vector - ME || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_fd10_HARP hmi.ME_720s_fd10_HARP] || [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_fd10_HARP_nrt hmi.ME_720s_fd10_HARP_nrt] ||


=== Selected HMI Science Data Products ===
'''Standard Pipeline'''
 . 45-second - full disk
  . Blos (hmi.M_45s)
  . Vlos (hmi.V_45s)
  . Continuum intensity (hmi.Ic_45s), line depth (hmi.Ld_45s), and line width (hmi.Lw_45s)
 . 12 - minute
  . Line-of-sight magnetic field (hmi.M_720s)
  . Doppler velocity (hmi.V_720s)
  . Continuum intensity (hmi.Ic_720s), line depth (hmi.Ld_720s), and line width (hmi.Lw_720)
  . Stokes vector (hmi.S_720s), the IQUV values at each of 5 wavelengths
  . Inverted Vector Field (hmi.ME_720s) VFISV - Milne-Eddington Inversion (not yet released)
  . Disambiguated Vector Field (patches), hmi.Bharp_720s (not yet released)
 . 3 (TBD) - hour
  . Disambiguated B on full disk, hmi.B (not yet released)
On Demand
 . 3-second filtergrams
 . 3-minute vector B on patches
 . 6-minute disambiguated patches
 . 12-minute full-disk disambiguated vector field
On Request
 . 135-second disambiguated patches
 . 135-second Stokes Vectors
 . Anything else
-Line 58:
+Line 83:
-    * Back to ["HMIModuleTable"]
+    * Back to ["Lev1Doc"]