Sodankylä Geophysical Observatory

SGO Riometer Networks

Active spectral riometer stations (09/2024):

station start of operation geographic
co-ordinates 		L-val. MHz timing
KEVO 09/2020 69.75°N 27.02°E 6.5 20-55.0 GPS 10MHz ref.
KILPISJÄRVI * 10/2022 69.07°N 20.75°E 6 20-55.0 GPS 10MHz ref.
ABISKO 09/2019 68.40°N 18.90°E 5.6 20-55.0 GPS 10MHz ref.
IVALO 10/2020 68.55°N 27.28°E 5.5 20-55.0 GPS 10MHz ref.
SODANKYLÄ 03/2019 67.42°N 26.39°E 5.1 20-55.0 GPS 10MHz ref.
OULU 06/2019 65.08°N 25.90°E 4.6 20-55.0 GPS 10MHz ref.
OULUJÄRVI * 10/2023 64.52°N 27.23°E 4.4 20-55.0 GPS 10MHz ref.
JYVÄSKYLÄ 09/2021 62.42°N 25.28°E 3.9 20-55.0 GPS 10MHz ref.
* = Collaborative instrument.

Active La Jolla riometer stations (09/2024):

station start of operation geographic
co-ordinates 		L-val. MHz timing AD converter sampling temp record
IVALO 1994 68.55°N 27.28°E 5.5 29.9 (-29.1.2018)
30.0 (29.1.2018-) 		GPS 16-bit 10 Hz yes
SODANKYLÄ 1994 67.42°N 26.39°E 5.1 30.0 GPS 16-bit 10 Hz yes
ROVANIEMI 1994 66.78°N 25.94°E 4.8 32.4 GPS 16-bit 10 Hz yes

All the active La Jolla riometers have dual half-wavelength dipole antenna, which forms 60 ° wide beam.

SGO La Jolla riometer stations with digital data storing:

station dig. rec.
geographic
co-ordinates 		L-val. MHz timing AD converter sampling temp record
HORNSUND 1996-2015 77.00°N 15.60°E 13.1 30.0 DCF 8-bit 10 s no
ABISKO 1996-2019 68.40°N 18.90°E 5.6 30.0 GPS 16-bit 10 Hz yes
IVALO 1994- 68.55°N 27.28°E 5.5 29.9 GPS 16-bit 10 Hz yes
SODANKYLÄ 1994- 67.42°N 26.39°E 5.1 30.0 GPS 16-bit 10 Hz yes
SODANKYLÄ 1993-2013 67.42°N 26.39°E 5.1 51.4 GPS 16-bit 10 Hz no
ROVANIEMI 1994- 66.78°N 25.94°E 4.8 32.4 GPS 16-bit 10 Hz yes
OULU 1994-2022 65.08°N 25.90°E 4.6 30.0 GPS 16-bit 10 Hz yes
JYVÄSKYLÄ 1994-2021 62.42°N 25.28°E 3.7 32.4 GPS 16-bit 10 Hz yes

Historical table of analogical riometers operated by SGO:

station oper.
since 		geographic
co-ordinates 		L-val. MHz type BW
kHz
reg.sweep
kHz s
min
det 		AGC ant rec
mm/h 		down/
up
HORNSUND 1981 77.00°N 15.60°E 13.1 30.0 LJ 30       x DD 60 1 s / 1 s
KEVO * 1968 69.75°N 27.02°E 6.0 27.6 DA 2 100 30 x x Y3 60 1 s / 1 m
KILPISJÄRVI * 1980 69.02°N 20.86°E 5.9 30.0 LJ 30       x DD 60 1 s / 1 s
IVALO 1972 68.55°N 27.28°E 5.5 29.9 LJ 30       x DD 60 1 s / 1 m
SODANKYLÄ * 1964 67.42°N 26.39°E 5.1 27.6 DA 2 100 30 x x Y3 60 1 s / 1 m
  1979                 x NB 60 1 s / 1 s
  1969     40.0 LJ 30       x DD 60 1 s / 1 s
  1984     51.4 LJ 30       x DD 60 1 s / 1 s
ROVANIEMI 1974 66.78°N 25.94°E 4.8 32.4 LJ 30       x DD 60 1 s / 1 m
OULU * 1967 65.08°N 25.90°E 4.3 29.7 DA 2 100 30 x x Y3 60 1 s / 1 s
JYVÄSKYLÄ 1974 62.42°N 25.28°E 3.7 32.4 LJ 30 100 30 x x DD 60 1 s / 1 m
NURMIJÄRVI * 1967 60.51°N 24.65°E 3.3 27.6 DA 2 100 30 x x DD 60 1 s / 1 m
ABISKO 1987 68.40°N 18.90°E 5.6 30.0 LJ 30       x DD 76 1 s / 1 s
        30.0 LJ 30       x NB 76 1 s / 1 s
VIDSEL 1987 65°48'N   30.0 LJ 30       x DD 76 1 s / 1 s
RAMFJORD 1987 69°42'N 6.15 30.0 LJ 30       x DD 76 1 s / 1 s
ANDENES 1987 69°18'N 6.15 30.0 LJ 30       x DD 76 1 s / 1 s
SIGLUFJORDUR 1987 66°12'N 6.7 30.0 LJ 30       x DD 76 1 s / 1 s
Legend:
type:
DA DAVID ANDERSEN
LJ LA JOLLA
antenna
Y3 3 el. YAGI
NB narrow beam
DD dual dipole
down/up
s second
m minute

Coordinates for Ivalo 68°34'N, 27°50'E until October 1991 at 27.6 MHz (DA)
Coordinates for Rovaniemi 66°34'N,25°50'E until September 1985 at 27.6 MHz (DA)
Coordinates for Jyväskylä 62°34'N, 25°40'E until December 1986 at 27.6 MHz(DA)

Last modified: 05 September 2024, 08:35:09.

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