TGO     DTU Space
The magnetic field in the previous 24 hours.
This display shows the magnetic condition in northwest Europe during the previous 24 hours in the form of time series - magnetogrammes - from 10 observing stations. They range from Svalbard and Tromsø in the auroral zone to mid-latitude in Denmark. The magnetogrammes are organized in a "stack plot" with a common horizontal time axis. Each magnetogramme is centred on a straight line representing the average value of the 24 hours. The number at the left hand end of the line is the value of this average (rarely important to space weather). The scale of the vertical magnetic field axis is common to all stations and is marked at the top right hand corner of the plot as a bar of 200 nT, alternatively 2 degrees. The scale is dynamic, at high activity the bar is short, at low it is long. At the right hand side is also given the codes for the stations and their corrected geomagnetic latitude (CGM) computed for the year 2015. The stations are ordered in decreasing latitude from top to bottom. They are listed in the table below.

Name

Code

Geogr. lat.

Geogr. long

CGM lat.

Ny-Ålesund

NAL

78.92

11.93

76.54

Hopen

HOP

76.51

25.01

73.48

Bear Island

BJN

74.50

19.00

71.77

North Cape

NOR

71.09

25.79

67.06

Tromsø

TRO

69.66

18.94

66.88

Dønna

DON

66.11

12.50

63.47

Rørvik

RVK

64.95

10.99

62.31

Dombås

DOB

62.07

9.11

59.29

Karmøy

KAR

59.21

5.24

56.31

Brorfelde

BFE

55.63

11.67

52.02

The horizontal component (H) of the field is default. Alternatively another component can be selected in the lower frame of the plot:

D - declination (angle in the horizontal plane between geographic and magnetic north, positive towards east).

Z - vertical component (positive down)

I -  inclination or dip angle (angle between the field vector and the horizontal plane, positive under the plane).

F - field strength or total field.

   

The period displayed is by default the last 24 hours. The previous UT day is displayed by using the "<-Prev. day" button. Clicking "Realtime" will restore to default.

Time resolution of the magnetogrammes is one minute.

18 August 2011, Truls Lynne Hansen
Last page update, 31 Mar. 2016 Børre Heitmann Holmeslet