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Last modified 21 April 2005
Geographical and geomagnetic positions of the EISCAT facilities
The geographic positions are generally based on a satellite survey from 1981 and agreed with the positions used inside EROS. The Tromsø geographic position comes from a later GPS measurement while the Longyearbyen latitude and longitude come from a measurement with a hand held GPS.The geomagnetic values are calculated for 1 January, 1984 using the IRGF1980 model. (IRGF model online form)
| Location | Tromsø | Kiruna | Sodankylä | Longyearbyen |
|---|---|---|---|---|
| Geographic Latitude |
69°35'11'' N 69.5864° |
67°51'38'' N 67.86056° |
67°21'49'' N 67.36361° |
78°09'11'' N 78.15305° |
| Geographical Longitude |
19°13'38'' E 19.2272° |
20°26'07'' E 20.43528° |
26°37'37'' E 26.62694° |
16°01'44'' E 16.02889° |
| Altitude | 86.28 m | 417.62 m | 197.03 m | 445 m |
| Geomagnetic | ||||
| Corr.geom.lat. | 66.107 | 64.279 | 63.424 | |
| Corr.geom.long. | 103.366 | 102.846 | 107.249 | |
| Invariant Latitude ground |
66°12' N 66.260° |
64°27' N 64.448° |
63°34' N 63.568° |
75°11' N 75.18° |
| Invariant Latitude 300km | 66.795° | 65.028° d | 64.149° | |
| Dip angle ground | 77.616° | 76.793° | 76.717° | 82.06° |
| Dip angle 300km | 77.588° | 76.721° | 76.631° | |
| Inclination | 77°30' N | 76°48' N | 76°43' N | 75°18' N |
| Declination ground | 3.376° | 3.958° | 7.440° | |
| Declination 300km | 1.596° | 2.261° | 5.406° | |
| L-shell value ground | 6.170 | 5.375 | 5.047 | |
| L-shell value 300km | 6.441 | 5.611 | 5.260 | |
| B-field north ground | 0.113 | 0.120 | 0.120 | |
| B-field north 300km | 0.100 | 0.107 | 0.107 | |
| B-field east ground | 0.007 | 0.008 | 0.016 | |
| B-field east 300km | 0.003 | 0.004 | 0.010 | |
| B-field down ground | 0.515 | 0.511 | 0.514 | |
| B-field down 300km | 0.456 | 0.452 | 0.454 | |
| B-field abs ground | 0.528 | 0.525 | 0.528 | |
| B-field abs 300km | 0.467 | 0.464 | 0.466 |
Radar system specification
| Location | Tromsø | Kiruna | Sodankylä | Longyearbyen | Tromsø Heater |
||
|---|---|---|---|---|---|---|---|
| Band | VHF | UHF | UHF | UHF | UHF | HF | |
| Transmit frequency band | 222.8-225.4 MHz | 926.6-930.5 MHz | 498.0-502.0 MHz | 4-8 MHz | |||
| Transmitter | 2 klystrons | 2 klystrons | 16 klystrons | ||||
| Peak Power | 2×1.5 MW | 2 MW | 1 MW | 12×100 kW | |||
| Average Power | 2×150 kW | 250 kW | 250 kW | ||||
| Pulse Duration | 1 µs-2.0 ms | 1 µs-2.0 ms | 1 µs-2.0 ms | 20 µs- | |||
| Min interpulse | 1.0 ms | 1.0 ms | 0.1 ms | 20 µs | |||
| Coding | binary phase shift (BPSK) | ||||||
| Receive frequency band | 214.3-234.7 MHz | 921.0-933.5 MHz | 925.0-931.5 MHz | 929.0-930.5 MHz | 485.0-515.0 MHz | ||
| Receiver | analog double superheterodyne | ||||||
| System Temperature | 250-350 K | 90-110 K | 30-35 K | 30-35 K | 65-75 K | ||
| Digital Processing | 14-bit 15MHz ADC, digital conversion to baseband Autocorrelation processor, 32-bit complex integer | ||||||
| Baseband channels | 6 | 6 | 6 | 6 | 6 | ||
| Antenna | 4, 30×40m parabolic cylinders | 32 m parabolic dish | 32 m parabolic dish | 32 m parabolic dish | 42 m and 32 m parabolic dishes | dipoles | |
| Feed system | line feed | Cassegrain | Cassegrain | Cassegrain | Cassegrain | ||
| Gain | 46 dBi | 48.1 dBi | 48.1 dBi | 48.1 dBi | 42.5 dBi or 44.8 dBi | 24 dBi or 30 dBi | |
| Polarization | circular | circular | any | any | circular | ||