Space Weather Correct (SWC)

Time-varying magnetic correction.

SWC uses geomagnetic observations and spatial modeling to estimate external magnetic-field changes at drilling locations. Regional SWC supports IFR2 with a compatible IFR1 baseline; SWC-Global provides worldwide correction.

Discuss SWC requirements Explore SWC products

Why SWC

Magnetic conditions change during a job.

Global models and IFR1 describe the reference field, but external magnetic disturbances also vary over time. SWC estimates these changes at the drilling location so corrections can reflect conditions at survey time.

Regional SWC can be used with Monarch IFR1 or another compatible IFR1 baseline to provide an IFR2-equivalent reference.

Observed and SWC-Alaska-predicted magnetic-field variations in field strength, declination, and inclination during a geomagnetic storm, showing close agreement through the day. — **SWC-Alaska validation, 12 November 2025.** Observed and predicted field-strength, declination, and inclination variations at an independent Alaska monitoring site. Observations: U.S. Geological Survey (USGS).

Regional SWC

SWC-CONUS and SWC-Alaska

Regional SWC products estimate time-varying magnetic-field changes without requiring a variometer at every drilling location. Combined with a compatible IFR1 baseline, they support IFR2-equivalent solutions.

SWC-CONUS

Contiguous United States

Time-varying external-field correction across the contiguous United States, using geomagnetic-observatory data and spatial modeling.

SWC-Alaska

Alaska

Regional correction for Alaska, where high geomagnetic latitude can bring larger, more rapid magnetic-field disturbances.

SWC-Global

Worldwide correction and HDGM-RT continuity.

SWC-Global estimates time-varying external-field changes worldwide, using methods suited to different geomagnetic regions. Together with HDGM2027, it continues the global time-varying functionality of HDGM-RT. SWC-Global can also complement IFR1, but IFR1 + SWC-Global is not classified as IFR2 under ISCWSA conventions.

SWC-Global modeled field-strength disturbance over mid- and low latitudes during the 12 November 2025 geomagnetic storm.

SWC-Global modeled field-strength disturbance over the northern polar region during the 12 November 2025 geomagnetic storm.

SWC-Global, 12 November 2025. Modeled field-strength disturbance at 08:30 UT over mid-/low latitudes and the northern polar region. Color scales differ by region. Input data include USGS and international geomagnetic observations.

Local measurements

Where regional coverage is insufficient.

A dedicated variometer or expanded observing network may be appropriate when existing observatory coverage cannot support the required correction. Monarch can evaluate local measurement requirements for a specific operation.

Validation & monitoring

Tested against observations.

SWC products are evaluated against geomagnetic measurements. Monarch monitors performance and alerts users when data gaps or other observation issues degrade the correction.

SWC products

Need time-varying correction for your operations?

Tell us the operating area, planned period, and any existing IFR1 coverage. We can discuss the appropriate regional, global, or local correction.

Contact Monarch contact@monarchmag.com