WMO OSCAR | Details for Variable: Geomagnetic field

Variable: Geomagnetic field

Definition

Full name	Geomagnetic field
Definition	Magnitude and direction of the 3D magnetic field on the surface of Earth and within the magnetosphere (i.e., in low-Earth orbit and in geosynchronous orbit).
Measuring Units	nanoTesla (nT)	Uncertainty Units	nanoTesla (nT)
Horizontal Res Units	km	Vertical Res Units
Stability Units	nanoTesla (nT) (Stability /decade)

Comment:	Besides the determination of the International Geomagnetic Reference Field (IGRF), among other models, which has many applications, geomagnetic field measurements are useful in Space Weather, at high temporal sampling, to detect geomagnetic disturbances within the magnetosphere. The reference frame is Cartesian or Cylindrical with many different orientations. Ground measurements have Bx, By and Bz as Cartesian magnetic field components oriented to geographical North, East and local Nadir, respectively. H, D and Z are also used as Cylindrical components with H oriented horizontally, D (declination) measuring the angle in relation to the local magnetic meridian and Z pointed to local Nadir.
Last modified:	2014-11-28
Applied in OSCAR/Space Gap Analysis:	Yes

Classification

Domain: Terrestrial
- Sub-domain: Solid Earth and magnetic field
  - Variable: Geomagnetic field
    - Measured in Layers:
      - Land surface
      - Geo
      - Leo

Cross-cutting themes:

Earth System Application Categories and its related Application Areas:
- 1. Space Weather Applications
- 1. Space Weather Applications
Unknown:
- Space Weather

Requirements defined for Geomagnetic field (2)

This tables shows all related requirements. For more operations/filtering, please consult the full list of Requirements
Note: In reading the values, goal is marked blue, breakthrough green, threshold orange
Application-dependent Technical Priority (ATP) Magenta and Relative priority of the attributes Red

Id	Variable	Layer	App Area	ATP	Uncertainty	Layer/s Quality	Coverage Quality	Stability / decade	Hor Res	Ver Res	Obs Cyc	Timeliness	Coverage	Conf Level	Val Date	Source	General Comment	Application Area Comment	Horizontal Coverage Comment	Observation Comment	Performance Comment
1161	Geomagnetic field	Land surface	1.3 Ionosphere, Thermosphere and Geomagnetic Field Forecasting and Monitoring	1.0	0.1 nanoTesla (nT) 0.3 nanoTesla (nT) 1 nanoTesla (nT) 0.5				100 km 200 km 500 km 0.5		1 sec 10 sec 60 sec 0.5	60 sec 10 min 60 min 0.5	Global land	tentative	2025-12-07	New source to be determined	Requirement for geomagnetic storm detection.	Submitted by Kirsti Kauristie AA 1.3 POC.		Geomagnetic storm evolution can be followed in near-real time with networks of flux gate magnetometers. These measurements do not necessarily fulfill all geomagnetic observatory standards in all measurement sites.	Attributes for Uncertainty and Stability need still discussions.
1162	Geomagnetic field	Land surface	1.3 Ionosphere, Thermosphere and Geomagnetic Field Forecasting and Monitoring	1.0	0.1 nanoTesla (nT) 0.3 nanoTesla (nT) 1 nanoTesla (nT) 0.5				100 km 200 km 500 km 0.5		1 sec 60 sec 15 min 0.5	60 sec 10 min 60 min 0.5	Global land	reasonable	2025-12-07	New source to be determined	Requirements for data to be used in the updates of the International Geomagnetic Reference Field	Values discussed with ET-SWX. Submitted by Kirsti Kauristie AA 1.3 POC.		Absolute magnetic field observations by geomagnetic observatories fulfilling the standards of INTERMAGNET.	Performance requirements to be updated according to the requirements of INTERMAGNET.