Parser for getting Earth magnetic fields values from www.swpc.noaa.gov
Parser for getting Earth magnetic field parameters from Space Weather Prediction Center - http://www.swpc.noaa.gov/.
This is simple pure nodejs data scrapper, that grabs data from here - http://www.swpc.noaa.gov/ftpdir/lists/geomag/Gp_mag_1m.txt and parses them as array.
var geomagnetic = require'geomagnetic';geomagneticiferr throw err;console.logdata;;
will return something like:
timestamp: 1399158180000time: Sun May 04 2014 03:03:00 GMT+0400 MSKHp: 63.7He: 75.2Hn: -7.73total: 98.8units: 'nanotesla (nT)'timestamp: 1399158240000time: Sun May 04 2014 03:04:00 GMT+0400 MSKHp: 64.4He: 76.2Hn: -9.04total: 100units: 'nanotesla (nT)'timestamp: 1399158300000time: Sun May 04 2014 03:05:00 GMT+0400 MSKHp: 64.5He: 77.1Hn: -9.51total: 101units: 'nanotesla (nT)'
The data is an array of objects with 4 fields:
timestamp - unix timestamp of moment when current measures are taken
Hp - component perpendicular to the satellite orbital plane or parallel to the Earth's spin axis
He - component perpendicular to Hp and directed earthwards
Hn - component perpendicular to both Hp and He, directed eastwards
total - absolute value of magnetic field - sqrt(Hp^2+He^2+Hn^2).
All data have units in
nanoteslas - nT.
total is probably measured by omni directional solenoid system,
not counted from He, Hp, Hn, so there is <5% discrepance.
Note 2: sometimes there is -100000 values for magnetic fields magnitutes. This is probably the error in data transfer or a way to show that data was not properly acquired. So, the user of library can simply negate this values.
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Copyright (c) 2013 Anatolij Ostroumov ostroumov095 at gmail dot com
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