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Size: 1058
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Size: 907
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
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| The corresponding data product is hmi.Marmask_720s. There is a corresponding near real time data product, | The corresponding data product is hmi.Marmask_720s. There is a corresponding near-real-time data product, |
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| The mask is an integer (char, or BITPIX = 8) value at each pixel. Currently the integer can be one of three values: 0 for off-disk, 1 for quiet, and 2 for magnetically active. We hope to add a facula class, especially as the intensity images become more well-calibrated. |
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| 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. |
We use two image series, magnetograms (from hmi.M_720s) and intensitygrams (from hmi.Ic_720s), to determine class membership. This first iteration of the masks concentrates on active regions, so we rely on the magnetograms almost exclusively to compute the masks. |
ARmask - HMI Active Region Full-Disk Masks
This is a full-disk data product that currently identifies magnetically active pixels. The corresponding data product is hmi.Marmask_720s. There is a corresponding near-real-time data product, which is used to get timely space weather information, called hmi.Marmask_720s_nrt. The mask is an integer (char, or BITPIX = 8) value at each pixel. Currently the integer can be one of three values: 0 for off-disk, 1 for quiet, and 2 for magnetically active. We hope to add a facula class, especially as the intensity images become more well-calibrated.
We use two image series, magnetograms (from hmi.M_720s) and intensitygrams (from hmi.Ic_720s), to determine class membership. This first iteration of the masks concentrates on active regions, so we rely on the magnetograms almost exclusively to compute the masks.