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Last Updated: 05/26/2022

MAG4

Version: v20190904

Uses line of sight (LOS) or vector magnetograms to measure free energy proxies for each AR on the solar disk. The free energy proxies include the gradient of the magnetic field across the neutral line, the magnetic shear angle across the neutral line, and others. These free energy proxies are used to relate to historically derived event rates, and with Poisson statistics, probabilities of the occurrence of >M-class flares, >X-class flare, CMEs, Fast CMEs, and SPEs within the next 24 hours.

Model results from LOS inputs are accurate for 30 heliocentric degrees and 45-60 heliocentric degrees for vector inputs.

There are many forecasts created from MAG4:

Shortname: MAG4_LOS_FEr [HMI-NRT] MAG4 Using Line-of-Sight HMI magnetogram. Free energy only. Near-Real-Time data. Shortname: MAG4_LOS_FEd definitive data

Shortname: MAG4_LOS_r [WF-HMI-NRT] MAG4 Using Line-of-Sight HMI magnetogram. Free energy with flares. Near-Real-Time data. Shortname: MAG4_LOS_d definitive data [WF=with flares]

Shortname: MAG4_SHARP_FE [V-HMI-NRT] "MAG4 Using vector SHARP tiles from HMI. Free energy only. Near-Real-Time data." Shortname: MAG4_HARP_FE MAG4 Using vector HARP tiles from HMI. Free energy only. Definitive data. [Uses MDI forecast curves] [V=Vector]

Shortname: MAG4_SHARP [VWF-HMI-NRT] MAG4 Using vector SHARP tiles from HMI. Free energy with flares. Near-Real-Time data. Shortname: MAG4_HARP MAG4 Using vector HARP tiles from HMI. Free energy with flares. Definitive data. [Uses MDI forecast curves] [WF=with flares] [V=Vector]

Shortname: MAG4_SHARP_HMI [VPLUS-HMI-NRT] MAG4 Using vector SHARP tiles from HMI. Free energy with flares. Near-Real-Time data. Shortname: MAG4_HARP_HMI MAG4 Using vector HARP tiles from HMI. Free energy with flares. Definitive data. [Was labelled VPLUS=Uses new forecast curves computed from HMI]

  1. FUTURE: MAG4_LOS_GONG_FE

  2. FUTURE: MAG4_LOS_GONG

Caveats:

Valid for LOS magnetogram (scientifically good to 30 heliocentric degrees), or vector (likely good to 45-60 heliocentric degrees).

Inputs

Line of sight (LOS) or vector magnetograms.

Outputs

Full disk and active region flare probabilities, full disk SEP (S1) probability, CME probability, and fast CME probability

Domains

  • Solar

Space Weather Impacts

  • Ionosphere variability (navigation, communications)
  • Solar energetic particles - SEPs (human exploration, aviation safety, aerospace assets functionality)

Publications

Code

Code Languages: IDL

Contacts

Publication Policy

In addition to any model-specific policy, please refer to the General Publication Policy.