QX/T 239-2014 in English
VALIDLevels of geomagnetic activity
- Issued on:2014-07-25
- Implemented on:2014-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
| Standard No: | QX/T 239-2014 |
| Document status: | VALID |
| Title in English: | Levels of geomagnetic activity |
| Title in Chinese: | 地磁活动水平分级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2014-07-25 |
| Implemented on: | 2014-12-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | geomagnetic station data
geomagnetic activity geomagnetic activity introduction interpretation geomagnetic storm satellite orbit correction plan geomagnetic induction current |
| Related Topics: | water activity
Analytical Balance Class II jc/t 239-2014 Surface water grade 3 or 4 Geomagnetism bottled water campaign activity level water activity water groundwater level QX Tertiary Analytical Balance Primary and secondary balances geomagnetic activity horizontal version Geomagnetic standard jc/t239-2014 Geomagnetic Standard |
Introduction
Interpretation of the core content of the standard
QX/T 239-2014 standard establishes a two-level classification system for geomagnetic activity:
| Classification dimension | Local classification (K index) | Global classification (Kp index) |
|---|---|---|
| Data source | Single geomagnetic station data | Weighted value of 13 standard stations around the world |
| Temporal resolution | 3 hours/period (UTC time) | |
| Grading threshold | Grade 0-9 (10 levels) | Grade 0-9 (28 levels) |
Analysis of key technical indicators
K index measurement specification
The disturbance amplitude of the horizontal component (H) or magnetic declination (D) is measured by the fluxgate magnetometer. The algorithm needs to exclude baseline drift and artificial interference. Typical application cases:
- In March 2017, the Beijing station recorded a K=7 strong disturbance event, corresponding to the geomagnetic storm warning
- Verification of the stability of the K index during the polar night at Zhongshan Station in Antarctica
Principle of Kp index calculation
Using global station network data, it is latitude corrected and standardized. Historical data shows:
| Frequency of Kp≥5 | Year of solar maximum: 15-20 days/year | Year of solar minimum: 3-5 days/year |
|---|
Recommendations for standard implementation
Monitoring system construction
It is recommended to configure GM-4 magnetometer + data acquisition system, with a sampling rate ≥0.1Hz, and regularly perform the following:
- Instrument absolute calibration (annual cycle)
- Baseline value review (monthly cycle)
- Data quality cross-validation
Business application scenarios
When Kp≥6, the following should be started:
- Satellite orbit correction plan
- Geomagnetic Induction Current (GIC) monitoring of power systems
- Suggestions for adjustment of shortwave communication frequency bands
Technology evolution analysis
Compared with the original classification scheme proposed by Mayaud in 1980, this standard has the following major improvements:
- Added data interface specifications for digital magnetometers
- Specified special processing algorithms for polar stations
- Established a mapping relationship with the NASA OMNI database
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