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SHARP Near-Real-Time Cylindrical-Equal-Area Data

(2011). SHARP Near-Real-Time Cylindrical-Equal-Area Data [Data set]. Joint Science Operations Center (JSOC), Stanford University. https://doi.org/10.48322/ejj7-n105. Accessed on .

Note: Proper references, including those in BibTex or other formats, should include the "Accessed on date" as shown above to identify the version of the resource being cited in a given publication.

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.

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Details

Version:2.6.1

NumericalData

ResourceID
spase://NASA/NumericalData/SDO/HMI/SHARP/CEA/NRT/PT720S
ResourceHeader
ResourceName
SHARP Near-Real-Time Cylindrical-Equal-Area Data
DOI
https://doi.org/10.48322/ejj7-n105
ReleaseDate
2024-11-02 00:08:46
RevisionHistory
RevisionEvent
ReleaseDate
2024-11-02 00:08:46
Note
Metadata created by SY
RevisionEvent
ReleaseDate
2024-11-18 00:08:46
Note
Added DOI by SY
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 00:00:00
PublishedBy
Joint Science Operations Center (JSOC), Stanford University
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Philip.H.Scherrer
2.GeneralContactspase://SMWG/Person/Rick.Bogart
InformationURL
Name
The HMI website at Stanford
URL
InformationURL
Name
The SDO/HMI Instrument paper
URL
InformationURL
Name
Spaceweather HMI Active Region Patch (SHARP)
URL
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
JSOC Data Center
URL
Style
Search
Description

Change the date and the time to find the HMI data.

Format
FITS
InstrumentIDs
MeasurementType
Magnetogram
MeasurementType
Dopplergram
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2012-09-14 02:12:00
RelativeStopDate
-P 3H
Cadence
PT720S
ObservedRegion
Sun
ObservedRegion
Sun.Photosphere
InputResourceID
InputResourceID
InputResourceID
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