Magnetic Field Investigation (VHM / FGM)

The Magnetic Field (HED) Investigation uses two sensors, a Vector Helium Magnetometer (VHM) and a Fluxgate Magnetomete (FGM), to determine the heliolatitude dependence of the interplanetary magnetic field. For more scientific information, visit the following Magnetometer team website:

VHM/FGM at Imperial College, London

Power and Mass Properties

 The instrument consists of 4 units:

Power Dissipation

Mass
kg

Mean

Peak

Heater

mA

W

mA

W

mA

W

HED 1

FGM Electronics and DPU

79.3

2.22

79.3

2.22

   

2.1079

HED 2

VHM Electronics

70.5

1.97

73.5

2.06

   

1.5357

HED 3

Fluxgate Magnetometer (VGM)

0.7

0.02

0.7

0.02

   

0.2973

HED 4

Vector Helium Magnetometer (VHM)

32.5

0.91

32.5

0.91

35.7

1.0

0.8174

 

HED 1 / HED 2 Harness

           

0.0626

Total

 

183.0

5.12

186.0

5.21

35.7

1.0

4.8209

Operational issues

Magnetometer calibrations are performed every two weeks.