Magnetometers Sweden

Stackplot SWE


KIR=Kiruna [IRF]

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Kiruna. H component

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Lycksele [SGU]


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Sundsvall [sm3esx]

Odensbacken [sm4ive]


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Moheda [sm7gvf]


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Abisko


ABK=Abisko [SGK]

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Acknowledgement SGU

Kiruna


KIR=Kiruna [IRF]




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The plots show the observed local magnetic field at Kiruna (KIR, 67.83N 20.42E)

The top panel in each plot shows the variation in the three components (x, y, z) at 1 minute resolution over the last 24 hours with the 24-hour averages subtracted. The scale nominally extends from -100 to 100 nT, but during disturbed times the scale is automatically adjusted to fit the range of variation.

The bottom panels show the time derivatives in each component in nT/min. Similarly, the scale is set at -100 to 100 nT/min but adjusted during larger variations.

References & Acknowledgement For more information about the Kiruna observatory via the observatory pages & IRF & TGO & WDC Kyoto

Jäkkvik


[SGU]

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Acknowledgement SGU TGO

Lycksele


[SGU]

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64.5924507, 18.6532821 Acknowledgement
SGU.se

Sundsvall


[sm3esx]

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 62°23’26.9″N 17°18’25.1″E 62.390797, 17.306969 Acknowledgement sm3esx.se

Uppsala


UPS=Uppsala [SGU]

Acknowledgement SGU

Odensbacken


[sm4ive]

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 59°09’47.9″N 15°31’34.7″E 59.163318, 15.526291 Acknowledgement sm4ive.com

Moheda


[sm7gvf]

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Lund


TOP=Tormestorp=Lund


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 56°06’42.6″N 13°44’36.9″E 56.111834, 13.743589 Acknowledgement lund.irf.se

Info

What’s a Magnetometer?

When the Earth is passing through a plasma cloud, the collisions of charged particles in the upper atmosphere cause disturbance to the Earth’s geomagnetic field. A magnetometer is a device that measures deviations in the Earth’s magnetic field, which might indicate that there is an aurora in progress. The greater the disturbance, the better the aurora is likely to be. The relationship between magnetometer readings and actual auroras in the sky is quite complex. It is possible to have strong auroras in the sky when the magnetometers are at seemingly background levels. Norwegian magnetometers provide the best correlation to visible auroras. In many cases, magnetometers fail to detect activity or react a couple of hours after the light show started.

Sensor: 3-axis, X (North-South, blue), Y (East-West, red), and Z (Vertical, green) – Geographic Coordinate System

SAM-III with (3) sensors

Read the magnetogram as folLows:

The horizontal scale is a 24-hour time scale in Coordinated Universal Time (UTC). Just above the horizontal axis are colored bars indicating the K-index for each period (this actually is a pseudo-K-index because it is calculated on each of the X, Y and Z components instead of the horizontal component [vector sum of X and Y]). The Highest K-index of the three appears at the top of the chart. The colors of the K-index bars are: Green: K3 and beLow, YelLow: K4 and K5, and Red: K6 and above.

A red alarm bar may appear just beLow the horizontal axis. The alarm is triggered when the magnetic field fluctuations reach a preset threshold within 20 minutes. For the above chart, the threshold is K5. A rapidly changing field indicates High probability of visible aurora.

The vertical scale shows magnetic induction (magnetic flux density, B) in nanoTeslas. The chart is normalized each day at 0000 UTC wherein the magnetic induction of all three components, Bx, By and Bz, are zeroed relative to the value at 23:59:59 UTC the day before. The vertical scale is automatically adjusted (auto-scale).

The color of each trace is indicated for Bx (Blue), By (Red) and Bz (Green) in the Lower-left corner of the chart.

Acknowledgement
SAM or reeve.com

Map


UTC?