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JSOC Data Center
SHARP Near-Real-Time Cylindrical-Equal-Area Data
var authors='The HMI Consortium: Stanford University (USA); NASA Goddard Space Flight Center (USA); Lockheed Martin Solar and Astrophysics Laboratory (USA); National Center for Atmospheric Research (USA)';
document.write(authors);
(2011).
SHARP Near-Real-Time Cylindrical-Equal-Area Data.
[Data set].
Stanford University.
https://doi.org/10.48322/ejj7-n105. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/SDO/HMI/SHARP/CEA/NRT/PT720S
Description
SHARP Near Real Time data in the Cylindrical Equal Area (CEA) Cartesian coordinate.
SHARP stands for Space-weather HMI Active Region Patch. A SHARP is a DRMS series that contains (1) various space-weather quantities calculated from the photospheric vector magnetogram data and stored as FITS header keywords, and (2) 31 data segments (described in detail below), including each component of the vector magnetic field, the line-of-sight magnetic field, continuum intensity, doppler velocity, error maps and bitmaps. The data segments are not full-disk; rather, they are partial-disk, automatically-identified active region patches. SHARPs are calculated every 12 minutes. Often, there is more than one active region on the solar disk at any given time. Thus, SHARPs are indexed by two prime keys: time, T_REC, and HMI Active Region Patch Number, HARPNUM.
The hmi.sharp_720s_cea_nrt and hmi.sharp_cea_720s data have been projected and remapped to a Cylindrical Equal Area (CEA) Cartesian coordinate system centered on the tracked active region. The size of the nrt regions will evolve with time. At each time step the definitive SHARPs will enclose the maximum extent of the region during it's disk passage. The three prime vector components are Bx, By, and Bz. HARP maps of 8 additional quantities are also provided at each time step: the three estimated component errors, the line-of-sight magnetogram, a Dopplergram, the continuum intensity, a map of the active pixels, and an estimate of the confidence in the disambiguation.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/SDO/HMI/SHARP/CEA/NRT/PT720S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
SHARP Near-Real-Time Cylindrical-Equal-Area Data
DOI
https://doi.org/10.48322/ejj7-n105
ReleaseDate
2026-07-21 12:07:11Z
RevisionHistory
RevisionEvent
ReleaseDate
2024-11-02 00:08:46Z
Note
Metadata created by SY
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ReleaseDate
2024-11-18 00:08:46Z
Note
Added DOI by SY
RevisionEvent
ReleaseDate
2025-09-18 11:27:09Z
Note
Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-09-30 14:25:18Z
Note
Updated PublishedBy name to match ROR Registry. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:31:26Z
Note
Added MetadataRightsList. Updated to 2.7.1. ZCB
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ReleaseDate
2026-06-26 13:27:56Z
Note
Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate, TemporalDescription:TimeSpan:StartDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:07:11Z
Note
Added HelioData InformationURL. JWL
Description
SHARP Near Real Time data in the Cylindrical Equal Area (CEA) Cartesian coordinate.
SHARP stands for Space-weather HMI Active Region Patch. A SHARP is a DRMS series that contains (1) various space-weather quantities calculated from the photospheric vector magnetogram data and stored as FITS header keywords, and (2) 31 data segments (described in detail below), including each component of the vector magnetic field, the line-of-sight magnetic field, continuum intensity, doppler velocity, error maps and bitmaps. The data segments are not full-disk; rather, they are partial-disk, automatically-identified active region patches. SHARPs are calculated every 12 minutes. Often, there is more than one active region on the solar disk at any given time. Thus, SHARPs are indexed by two prime keys: time, T_REC, and HMI Active Region Patch Number, HARPNUM.
The hmi.sharp_720s_cea_nrt and hmi.sharp_cea_720s data have been projected and remapped to a Cylindrical Equal Area (CEA) Cartesian coordinate system centered on the tracked active region. The size of the nrt regions will evolve with time. At each time step the definitive SHARPs will enclose the maximum extent of the region during it's disk passage. The three prime vector components are Bx, By, and Bz. HARP maps of 8 additional quantities are also provided at each time step: the three estimated component errors, the line-of-sight magnetogram, a Dopplergram, the continuum intensity, a map of the active pixels, and an estimate of the confidence in the disambiguation.
PublicationInfo
Authors
The HMI Consortium: Stanford University (USA); NASA Goddard Space Flight Center (USA); Lockheed Martin Solar and Astrophysics Laboratory (USA); National Center for Atmospheric Research (USA)
PublicationDate
2011-01-21 00:00:00Z
PublishedBy
Stanford University
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Philip.H.Scherrer
2.
GeneralContact
spase://SMWG/Person/Rick.Bogart
InformationURL
Name
The HMI website at Stanford
URL
http://hmi.stanford.edu/
InformationURL
Name
The SDO/HMI Instrument paper
URL
https://doi.org/10.1007/s11207-011-9834-2
InformationURL
Name
Spaceweather HMI Active Region Patch (SHARP)
URL
http://jsoc.stanford.edu/doc/data/hmi/sharp/sharp.htm
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/SDO_HMI_SHARP_CEA_NRT_PT720S
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
AccessInformation
RepositoryID
spase://SMWG/Repository/Stanford/HMI-AIA.JSOC
Availability
Online
AccessRights
Open
AccessURL
Name
JSOC Data Center
URL
http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.sharp_720s_cea_nrt
Style
Search
Description
Change the date and the time to find the HMI data.
Format
FITS
InstrumentIDs
spase://SMWG/Instrument/SDO/HMI
MeasurementType
Magnetogram
MeasurementType
Dopplergram
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2012-09-14 02:12:00Z
RelativeStopDate
-P 3H
Cadence
PT720S
ObservedRegion
Sun
ObservedRegion
Sun.Photosphere
InputResourceID
spase://NASA/NumericalData/SDO/HMI/LOS_Magnetogram/PT720S
InputResourceID
spase://NASA/NumericalData/SDO/HMI/LOS_Dopplergram/PT720S
InputResourceID
spase://NASA/NumericalData/SDO/HMI/Continuum_Intensity/PT720S
Parameter #1
Name
USFLUX in the FITS Header
Description
Total unsigned flux
Units
Mx
Field
Qualifier
Total
FieldQuantity
Magnetic
Parameter #2
Name
MEANGAM in the FITS Header
Description
Mean inclination angle, gamma
Units
degree
Field
Qualifier
Average
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #3
Name
MEANGBT in the FITS Header
Description
Mean value of the total field gradient
Units
Gauss/Mm
Field
Qualifier
Average
Qualifier
Differential
FieldQuantity
Magnetic
Parameter #4
Name
MEANGBZ in the FITS Header
Description
Mean value of the vertical field gradient
Units
Gauss/Mm
Field
Qualifier
Average
Qualifier
Differential
FieldQuantity
Magnetic
Parameter #5
Name
MEANGBH in the FITS Header
Description
Mean value of the horizontal field gradient
Units
Gauss/Mm
Field
Qualifier
Average
Qualifier
Differential
FieldQuantity
Magnetic
Parameter #6
Name
MEANJZD in the FITS Header
Description
Mean vertical current density
Units
mA/m^2
Field
Qualifier
Average
FieldQuantity
CurrentDensity
Parameter #7
Name
TOTUSJZ in the FITS Header
Description
Total unsigned vertical current
Units
Amperes
Field
Qualifier
Total
FieldQuantity
Current
Parameter #8
Name
MEANALP in the FITS Header
Description
Mean current helicity
Units
G^2/m
Support
SupportQuantity
Other
Parameter #9
Name
TOTUSJH in the FITS Header
Description
Total unsigned current helicity
Units
G^2/m
Support
SupportQuantity
Other
Parameter #10
Name
ABSNJZH in the FITS Header
Description
Absolute value of the net current helicity
Units
G^2/m
Support
SupportQuantity
Other
Parameter #11
Name
SAVNCPP in the FITS Header
Description
Sum of the Absolute Value of the Net Currents Per Polarity
Units
Amperes
Field
FieldQuantity
Current
Parameter #12
Name
MEANPOT in the FITS Header
Description
Mean photospheric excess magnetic energy density
Units
ergs/cm^3
Field
Qualifier
Average
FieldQuantity
Potential
Parameter #13
Name
TOTPOT in the FITS Header
Description
Total photospheric magnetic energy density
Units
ergs/cm^3
Field
Qualifier
Total
FieldQuantity
Potential
Parameter #14
Name
SHRGT45 in the FITS Header
Description
Percentage of pixels with a mean shear angle greater than 45 degrees
Units
percent
Support
SupportQuantity
Other
Parameter #15
Name
MAGNETOGRAM
Description
The magnetogram segment contains HARP-sized line-of-sight magnetogram data from the DRMS series hmi.M_720s.
CEA version: the field is remapped, but not projected, i.e. it is still the line-of-sight component relative to HMI.
Units
gauss
Field
FieldQuantity
Magnetic
Parameter #16
Name
BITMAP
Description
The bitmap segment identifies the pixels located within the smooth bounding curve by labeling each pixel with the following:
1 : weak field outside smooth bounding curve
2 : strong field outside smooth bounding curve
33 : weak field inside smooth bounding curve
34 : strong field inside smooth bounding curve
CEA version: same.
Units
dimensionless
Support
SupportQuantity
Other
Parameter #17
Name
DOPPLERGRAM
Description
The dopplergram segment contains HARP-sized dopplergram data from the DRMS series hmi.V_720s.
CEA version: the Doppler velocity is remapped, but not projected, i.e. it is still the line-of-sight component relative to HMI.
Units
m/s
Particle
ParticleType
Ion
ParticleQuantity
Velocity
Parameter #18
Name
CONTINUUM
Description
The dopplergram segment contains HARP-sized dopplergram data from the DRMS series hmi.Ic_720s.
CEA Version: same.
Units
DN/s
Wave
WaveType
Electromagnetic
WaveQuantity
Intensity
Parameter #19
Name
CONFID_MAP
Description
The confid_map segment identifies the confidence index of the inversion output. The index value at each pixel will take the integer value from 0 (best) to 6(worst), defined as the highest item number satisfying the following conditions:
0: No issue found in the input Stokes
1: Signals for the transverse field component in the input Stokes parameters (Q & U) were weak.
2: Signal for the line-of-sight field component in the input Stokes parameters (V) was weak.
3: Magnetic field signals of both LoS and transverse component were weak.
4: The ME-VFISV iteration did not converge within the iteration maximum.
In the test data release, we set very small , thus, the confidence ε index at most pixels may be 4.
5: If the difference between the absolute value of the line-of-sight field strength derived from magnetogram algorithm and the absolute value of the LoS component from VFISV inversion |B cos(inclination)| is greater than 500 Gauss, we regard the inversion did not well solve the problem.
6: One (or more) of the 24 input Stokes arrays had NaN value.
Units
dimensionless
Support
SupportQuantity
Other
Parameter #20
Name
Bp
Description
Phi (westward) component of the CEA vector magnetic field.
Units
gauss
Field
FieldQuantity
Magnetic
Parameter #21
Name
Bt
Description
Theta (southward) component of the CEA vector magnetic field.
Units
gauss
Field
FieldQuantity
Magnetic
Parameter #22
Name
Br
Description
Radial (out of photosphere) component of the CEA vector magnetic field.
Units
gauss
Field
FieldQuantity
Magnetic