Data is recorded in the matlab4 data format and consists of several blocks:

• the experiment info, d_ExpInfo (ASCII string)
• the antenna parameters (see below), d_parbl (32 bit reals) as described in the following
• the data, d_data (2×32 bit complex reals)
• the raw samples (not always present), d_raw (216 bit complex integers)

Parameter block layout (d_parbl)

Table follows below. Comments:

• Some parameters are relevant only for one system e.g.13-20, 23-30 ESR transmitter
• Parameters 65 and up are different depending on system
• Antenna ID parameter 41:
  • 1 32m ESR
  • 2 42m ESR
  • 3 VHF
  • 4 UHF
  • 5 Kiruna
  • 6 Sodankylä
  • 8 32p ESR
• ESR parameter 67
  • 0 SPEAR all tx off
  • 1 SPEAR low power radar
  • 2 SPEAR high power radar
  • 3 SPEAR heating
• ESR parameter 68
  • 0 Lower plasma line LO1 set to 492 MHz and upper plasma line LO1 to 502 MHz
  • 1 Lower plasma line LO1 set to 496 MHz and upper plasma line LO1 to 502 MHz
  • 2 Lower plasma line LO1 set to 492 MHz and upper plasma line LO1 to 506 MHz
  • 3 Lower plasma line LO1 set to 496 MHz and upper plasma line LO1 to 506 MHz

• UHF parameter 67 and VHF parameter 72 give the power status of the Tromsø systems as follows:
  • Bit 0 UHF RF on
  • Bit 1 UHF HV on
  • Bit 2 UHF power on
  • Bit 3 VHF RF on
  • Bit 4 VHF HV on
  • Bit 5 VHF power on
  • Bit 6 Heating RF on
  • Bit 7 Heating power on
• VHF parameter 69 is decoded like this:
  • bits 0:1 Antenna phasing
    • 0 allB
    • 2 allA
    • 3 splitbit
  • bits 2:5 IF setup Positive logic Note these values are integers
    • bit 2 lo1/chI  0 298 MHz 1 290 MHz
    • bit 3 lo1/chII 0 298 MHz 1 290 MHz
    • bit 4 lo2/chI  0 84 MHz 1 78 MHz
    • bit 5 lo2/chII 0 84 MHz 1 78 MHz