HARP - HMI Active Region Patches

A HARP is an HMI Active Region Patch that is identified in one or more HMI line-of-sight magnetograms. HARPs may be observed over an extended time interval. Each HARP has a serial number, the HARP_ID, that will often be linked with a NOAA Active Region. This data series provides pointers to information covering the entire disk passage for each HARP in the HMI catalog.

The data series tracks patches by associating information from other data series using links to maps and parameters computed for patches identified in individual magnetograms and intensity images. There are no actual data segments, just links to vector, line-of-sight, and intensity data and associated keywords.

# SERIES INFO

• DATANAME = HARP
• RETENTION = 0
• ARCHIVE = 0
• PRIMEKEYS = HARP_ID, T_REC

# PRIME KEY INFO

• HARPID, INT
• T_REC, TIME, Slotted
• T_REC_STEP = 12MIN
• T_REC_EPOCH = 1976.12.31_23:59:45.000_UTC

# PATCH INFO

• PNUM - The patch number of the HARP at T_REC in the Patches_Found dataseries

• AREA, link,"AREA", patch - The AREA keyword of the patch

• I_MIN, link, "I_MIN", patch

• FLUX, link,"FLUX",vecpatch - The computed flux of the vector field in the patch

• BTOT, link, "BTOT", vecpatch
• # OTHER information about the patches

# SEGMENT INFO - links

• data: arp_map, link, patch - Pointer to the bitmap of the patch

• data: blos, link, patch - Pointer to pointer to line-of-sight magnetic field data

• data: BTOT, link, vecpatch - Pointer to pointer to vector magnetic field data

# LINKS

• link: patch, "Patches_Found", static
• link: vecpatch, "Vector_Patches", dynamic

= Related Data Series

• PatchesFound

• VectorPatches