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HomeWorld Data CentreData CatalogueData FormatsIonospheric Median Data Format Tuesday, Dec 12 2017 04:23 UT
Data Catalogue

Ionospheric Median Data Format

One median data file contains all available yearly data for the corresponding station and median parameter. Downloaded median data files from SWS website have names of the form:

SSSS.PP

where:

  • SSSS - SWS Station Number, listed in following table
  • PP - URSI parameter code, listed in following table

The format of each record in a data file is as follows.

Character position Content
1-4 SWS Station Number
5-6 URSI parameter code
7-8 month
9-10 year
11-12 "40"
fields 13-168 24 space-separated hourly values and count (QVVVDCC)

where:

  • Q = qualifier
  • VVV = value
  • D = descriptor
  • CC = count (hourly values with counts less than 5 are not included)

Data is in universal time (UT). The first hour of each record is 0000 UT.

Note: Macquarie Island data from 1950 - 1958 is in local time (157.5 EMT, or 10.5 hours ahead of 00UT). The first hour of each record for this period is 0000 LT (midnight).

The URSI parameter codes are as follows.

Code Parameter Units Ref. UAG23 Definition
00 foF2 0.1 MHz 1.11 Ordinary wave critical frequency of the highest stratification in the F region.
03 M(3000)F2 0.05 1.50 Maximum usable frequency at a defined distance divided by the critical frequency of that layer.

Below are two lists of the stations. In the first list, stations are sorted by their SWS station numbers. In the second list, the stations are sorted alphabetically. Geographic coordinates are given; southern latitudes are negative.

Stations sorted by SWS station number:

SWS Station number Station name latitude longitude
0019GREAT BADDOW51.430.29
0022POITIERS46.350.20
0025TORTOSA40.480.31
0040DAPANGO10.520.12
0090POLE STATION-89.99346.68
0119DE BILT52.065.10
0120DOURBES50.243.47
0121PARIS/BAGNEUX48.485.88
0122GARCHY47.303.10
0134TAMANRASSET22.795.53
0141IBADAN7.433.90
0218ST PETER-ORDING54.188.37
0221FREIBURG/KOCHEL47.597.51
0222SOTTENS/SCHWARZENBERG46.497.21
0223MONTE CAPELLINO44.558.96
0315KJELLER60.0011.10
0318JULIUSRUH/RUGEN54.6013.40
0319LINDAU/HARZ52.5811.10
0324ROME41.5412.29
0326GIBILMANNA37.5914.01
0406LONGYEARBYEN78.1215.40
0415UPPSALA50.9017.35
0420PRUHONICE49.9914.55
0421GRAZ47.0515.27
0447KINSHASA-BINZA/LEOPOLDVILLE-4.1815.18
0455TSUMEB-19.1317.42
0510TROMSO69.6618.94
0511KIRUNA67.8320.42
0513LYCKSELE64.3618.40
0518KALININGRAD54.4320.30
0519MIEDZESZYN52.1520.40
0521BUDAPEST47.3019.05
0523BEOGRAD44.5020.30
0524BEKESCSABA46.4121.06
0543BANGUI4.2218.35
0562CAPE TOWN/HERMANUS-33.5518.22
0612LULEA65.3422.10
0615NURMIJARVI60.2824.48
0624SOFIA42.4123.19
0626ATHENS37.5823.43
0662GRAHAMSTOWN-33.2826.48
0711SODANKYLA67.2926.32
0746LWIRO-2.3028.80
0751ELIZABETHVILLE-11.4027.28
0758JOHANNESBURG-26.1528.10
0810MURMANSK68.6333.25
0815ST PETERSBURG/LENINGRAD59.5530.15
0820KIEV50.7230.31
0844BUNIA1.3430.15
0917MOSCOW55.4737.31
0923SIMFEROPOL44.5734.06
0946NAIROBI-1.1736.49
1013ARCHANGELSK64.3440.32
1021ROSTOV-ON-DON47.1439.42
1080SYOWA STATION-69.0039.35
1119GORKY56.2044.00
1124TBILISI42.0944.71
1139DJIBOUTI11.3643.09
1254TANANARIVE-18.5547.31
1305TIKHAJA BAY80.3352.80
1327TEHRAN35.4051.26
1405KRENKEL POLAR STATION80.5058.00
1456LA REUNION-21.0655.36
1510AMDERMA69.4561.39
1517SVERDLOVSK56.5161.07
1522NOVO KAZAKINSK45.5062.10
1526ASHKHABAD37.9558.12
1679MAWSON-67.3662.52
1712SALEKHARD66.3366.35
1724TASHKENT41.2069.18
1820KARAGANDA49.5073.10
1834AHMEDABAD23.0272.35
1836BOMBAY19.1172.50
1870KERGUELEN ISLAND-49.1569.10
1923ALMA ATA43.1576.57
1931DELHI28.3777.12
1940KODAIKANAL10.2377.46
1941THUMBA/TRIVANDRUM8.5376.87
1979DAVIS-68.3577.58
2008DIKSON ISLAND/DIXON ISLAND73.5480.56
2036HYDERABAD17.4178.56
2038MADRAS13.0480.16
2040TIRUCHIRAPELLI10.4878.41
2117TOMSK56.4784.93
2118NOVOSIBIRSK55.0282.55
2210NORILSK69.2088.06
2214PODKAMENNAYA TUNGUSKA61.4590.13
2378MIRNEY-66.3393.00
2451COCOS ISLANDS-12.1096.55
2538BANGKOK13.45100.31
2619IRKUTSK52.17104.45
2644SINGAPORE1.17103.50
2730CHUNGKING29.39106.34
2784VOSTOK-78.45106.87
2807PREOBRAZHENIYA74.66112.93
2819CHITA52.03113.30
2832CANTON23.09113.34
2834MACAU22.14113.35
2835HAIKOU20.06110.21
2856LEARMONTH-22.25114.08
2878CASEY/WILKES-66.17110.32
2920MANCHOULI49.35117.22
2925BEIJING39.55116.25
2960WATHEROO-30.32115.88
2961MUNDARING-31.54116.10
3032TAIPEI/CHUNG-LI24.95121.22
3038MANILA14.35120.59
3209TIXIE BAY71.58128.48
3214YAKUTSK62.02129.72
3226SEOUL37.33126.58
3232OKINAWA26.31127.59
3329YAMAGAWA31.12130.39
3351DARWIN-12.28130.50
3355TENNANT CREEK-19.40134.10
3357ALICE SPRINGS-23.42133.53
3421KHABAROVSK48.50135.10
3446BIAK-1.18136.12
3460WOOMERA-31.31137.10
3522WAKKANAI45.25141.40
3525AKITA39.43140.07
3527TOKYO35.42139.46
3546VANIMO-2.40141.20
3562SALISBURY-34.46138.38
3578ADELIE LAND-66.66140.02
3622YUZHNO-SAKHALINSK46.95142.72
3638GUAM13.58144.87
3650CAPE YORK-14.00142.30
3715MAGADAN59.34150.48
3750PORT MORESBY-9.30147.10
3755TOWNSVILLE-19.16146.48
3763CANBERRA-35.17149.08
3766HOBART-42.53147.19
3859BRISBANE-27.28153.02
3862CAMDEN-34.03150.42
4018PETROPAVLOVSK52.90158.64
4072MACQUARIE ISLAND-54.30158.56
4182TERRA NOVA BAY-74.45164.30
4260NORFOLK ISLAND-29.02167.57
4271CAMPBELL ISLAND-52.30169.00
4284SCOTT BASE-77.85166.78
4367CHRISTCHURCH-43.42172.38
4381CAPE HALLETT-72.19170.18
4464AUCKLAND-36.53174.45
4511CAPE SCHMIDT68.80179.50
4619ADAK51.52183.61
4660RAOUL ISLAND/KERMADEC ISLANDS-29.50181.85
4712WELLEN66.13190.17
4713PROVIDENIE BAY64.23186.82
4755NIUE-19.03190.08
4942PALMYRA5.52197.94
5056RAROTONGA-21.14200.54
5109POINT BARROW71.30203.22
5135KIHEI/MAUI20.45203.85
5144CHRISTMAS ISLAND1.52202.80
5308EIELSON AFB64.50213.00
5313COLLEGE/FAIRBANKS64.82212.13
5314ANCHORAGE61.17209.98
5354TARAVAO/TAHITI-17.56210.39
5718PRINCE RUPERT54.18229.83
5926SAN FRANCISCO37.77237.57
6027POINT ARGUELLO34.35239.62
6028VANDENBURG AFB34.43239.67
6085BYRD-79.98240.00
6329WHITE SANDS32.22253.77
6425BOULDER40.13254.77
6528DYESS AFB32.25260.49
6535MEXICO CITY/EL CERILLO19.24260.91
6608RESOLUTE BAY74.69265.11
6613BAKER LAKE64.15263.97
6616CHURCHILL58.47265.88
6620WINNIPEG/KENORA49.47265.71
6730BATON ROUGE30.53268.85
6829EGLIN AFB30.29273.70
7032GRAND BAHAMA ISLAND26.40281.80
7040PANAMA CANAL ZONE9.20280.70
7047TALARA-4.63278.75
7122OTTAWA45.25284.58
7125FORT BELVOIR/WASHINGTON38.85282.97
7126WALLOPS ISLAND37.52284.73
7143BOGOTA4.18285.52
7151HUANCAYO-12.05284.67
7223MAYNARD42.30288.67
7224BOSTON42.37288.97
7225FORT MONMOUTH40.19285.98
7263CONCEPCION-36.50286.97
7307THULE77.48290.83
7310CLYDE RIVER70.25291.70
7316FORT CHIMO58.10291.70
7336SAN JUAN/PUERTO RICO18.12293.85
7353LA PAZ-16.30291.91
7372USHUAIA-54.47291.80
7458TUCUMAN-26.49294.87
7477ARGENTINE ISLANDS/PORT LOCKROY-65.25295.73
7518GOOSE BAY53.19299.76
7540TRINIDAD10.30298.85
7562BUENOS AIRES-34.36301.73
7576DECEPCION-62.57299.62
7642PARAMARIBO5.81304.78
7671PORT STANLEY-51.42302.49
7710GODHAVN69.15306.67
7721ST JOHNS47.60307.32
7857SAO PAULO-23.32313.63
7914NARSSARSSUAQ60.54314.80
8084ELLSWORTH-77.40318.90
8172SOUTH GEORGIA-54.15323.55
8383HALLEY BAY-75.52333.40
8513REYKJAVIK64.09338.49
8638DAKAR14.40342.74
8726LISBON38.43350.92
8816SOUTH UIST57.15352.76
8828RABAT34.02353.49
8829CASABLANCA33.39352.65
8916INVERNESS/FRASERBURGH/BURGHEAD57.27356.51
8921LANNION48.44356.72
8939OUAGADOUGOU12.22358.69
8980SANAE-70.31357.59

Stations sorted alphabetically:

SWS Station number Station name Latitude Longitude
4619ADAK51.52183.61
3578ADELIE LAND-66.66140.02
1834AHMEDABAD23.0272.35
3525AKITA39.43140.07
3357ALICE SPRINGS-23.42133.53
1923ALMA ATA43.1576.57
1510AMDERMA69.4561.39
5314ANCHORAGE61.17209.98
1013ARCHANGELSK64.3440.32
7477ARGENTINE ISLAND-65.25295.73
1526ASHKHABAD37.9558.12
0626ATHENS37.5823.43
4464AUCKLAND-36.53174.45
0121BAGNEUX48.485.88
6613BAKER LAKE64.15263.97
2538BANGKOK13.45100.31
0543BANGUI4.2218.35
6730BATON ROUGE30.53268.85
2925BEIJING39.55116.25
0524BEKESCSABA46.4121.06
0523BEOGRAD44.5020.30
3446BIAK-1.18136.12
7143BOGOTA4.18285.52
1836BOMBAY19.1172.50
7224BOSTON42.37288.97
6425BOULDER40.13254.77
3859BRISBANE-27.28153.02
0521BUDAPEST47.3019.05
7562BUENOS AIRES-34.36301.73
0844BUNIA1.3430.15
8916BURGHEAD57.27356.51
6085BYRD-79.98240.00
3862CAMDEN-34.03150.42
4271CAMPBELL ISLAND-52.30169.00
3763CANBERRA-35.17149.08
2832CANTON23.09113.34
4381CAPE HALLETT-72.19170.18
4511CAPE SCHMIDT68.80179.50
0562CAPE TOWN-33.5518.22
3650CAPE YORK-14.00142.30
8829CASABLANCA33.39352.65
2878CASEY-66.17110.32
2819CHITA52.03113.30
4367CHRISTCHURCH-43.42172.38
5144CHRISTMAS ISLAND1.52202.80
2730CHUNGKING29.39106.34
3032CHUNG-LI24.95121.22
6616CHURCHILL58.47265.88
7310CLYDE RIVER70.25291.70
2451COCOS ISLANDS-12.1096.55
5313COLLEGE64.82212.13
7263CONCEPCION-36.50286.97
8638DAKAR14.40342.74
0040DAPANGO10.520.12
3351DARWIN-12.28130.50
1979DAVIS-68.3577.58
0119DE BILT52.065.10
7576DECEPCION-62.57299.62
1931DELHI28.3777.12
2008DIKSON ISLAND73.5480.56
2008DIXON ISLAND73.5480.56
1139DJIBOUTI11.3643.09
0120DOURBES50.243.47
6528DYESS AFB32.25260.49
6829EGLIN AFB30.29273.70
5308EIELSON AFB64.50213.00
6535EL CERILLO19.24260.91
0751ELIZABETHVILLE-11.4027.28
8084ELLSWORTH-77.40318.90
5313FAIRBANKS64.82212.13
7125FORT BELVOIR38.85282.97
7316FORT CHIMO58.10291.70
7225FORT MONMOUTH40.19285.98
8916FRASERBURGH57.27356.51
0221FREIBURG47.597.51
0122GARCHY47.303.10
0326GIBILMANNA37.5914.01
7710GODHAVN69.15306.67
7518GOOSE BAY53.19299.76
1119GORKY56.2044.00
0662GRAHAMSTOWN-33.2826.48
7032GRAND BAHAMA ISLAND26.40281.80
0421GRAZ47.0515.27
0019GREAT BADDOW51.430.29
3638GUAM13.58144.87
2835HAIKOU20.06110.21
8383HALLEY BAY-75.52333.40
0319HARZ52.5811.10
0562HERMANUS-33.5518.22
3766HOBART-42.53147.19
7151HUANCAYO-12.05284.67
2036HYDERABAD17.4178.56
0141IBADAN7.433.90
8916INVERNESS57.27356.51
2619IRKUTSK52.17104.45
0758JOHANNESBURG-26.1528.10
0318JULIUSRUH54.6013.40
0518KALININGRAD54.4320.30
1820KARAGANDA49.5073.10
6620KENORA49.47265.71
1870KERGUELEN ISLAND-49.1569.10
4660KERMADEC ISLANDS-29.50181.85
3421KHABAROVSK48.50135.10
0820KIEV50.7230.31
5135KIHEI20.45203.85
0447KINSHASA-BINZA-4.1815.18
0511KIRUNA67.8320.42
0315KJELLER60.0011.10
0221KOCHEL47.597.51
1940KODAIKANAL10.2377.46
1405KRENKEL POLAR STATION80.5058.00
8921LANNION48.44356.72
7353LA PAZ-16.30291.91
1456LA REUNION-21.0655.36
2856LEARMONTH-22.25114.08
0815LENINGRAD59.5530.15
0447LEOPOLDVILLE-4.1815.18
0319LINDAU52.5811.10
8726LISBON38.43350.92
0406LONGYEARBYEN78.1215.40
0612LULEA65.3422.10
0746LWIRO-2.3028.80
0513LYCKSELE64.3618.40
2834MACAU22.14113.35
4072MACQUARIE ISLAND-54.30158.56
2038MADRAS13.0480.16
3715MAGADAN59.34150.48
2920MANCHOULI49.35117.22
3038MANILA14.35120.59
5135MAUI20.45203.85
1679MAWSON-67.3662.52
7223MAYNARD42.30288.67
6535MEXICO CITY19.24260.91
0519MIEDZESZYN52.1520.40
2378MIRNEY-66.3393.00
0223MONTE CAPELLINO44.558.96
0917MOSCOW55.4737.31
2961MUNDARING-31.54116.10
0810MURMANSK68.6333.25
0946NAIROBI-1.1736.49
7914NARSSARSSUAQ60.54314.80
4755NIUE-19.03190.08
4260NORFOLK ISLAND-29.02167.57
2210NORILSK69.2088.06
1522NOVO KAZAKINSK45.5062.10
2118NOVOSIBIRSK55.0282.55
0615NURMIJARVI60.2824.48
3232OKINAWA26.31127.59
7122OTTAWA45.25284.58
8939OUAGADOUGOU12.22358.69
4942PALMYRA5.52197.94
7040PANAMA CANAL ZONE9.20280.70
7642PARAMARIBO5.81304.78
0121PARIS48.485.88
4018PETROPAVLOVSK52.90158.64
2214PODKAMENNAYA TUNGUSKA61.4590.13
6027POINT ARGUELLO34.35239.62
5109POINT BARROW71.30203.22
0022POITIERS46.350.20
0090POLE STATION-89.99346.68
7477PORT LOCKROY-65.25295.73
3750PORT MORESBY-9.30147.10
7671PORT STANLEY-51.42302.49
2807PREOBRAZHENIYA74.66112.93
5718PRINCE RUPERT54.18229.83
4713PROVIDENIE BAY64.23186.82
0420PRUHONICE49.9914.55
7336PUERTO RICO18.12293.85
8828RABAT34.02353.49
4660RAOUL ISLAND-29.50181.85
5056RAROTONGA-21.14200.54
6608RESOLUTE BAY74.69265.11
8513REYKJAVIK64.09338.49
0324ROME41.5412.29
1021ROSTOV-ON-DON47.1439.42
0318RUGEN54.6013.40
7721ST JOHNS47.60307.32
0218ST PETER-ORDING54.188.37
0815ST PETERSBURG59.5530.15
1712SALEKHARD66.3366.35
3562SALISBURY-34.46138.38
8980SANAE-70.31357.59
5926SAN FRANCISCO37.77237.57
7336SAN JUAN18.12293.85
7857SAO PAULO-23.32313.63
0222SCHWARZENBERG46.497.21
4284SCOTT BASE-77.85166.78
3226SEOUL37.33126.58
0923SIMFEROPOL44.5734.06
2644SINGAPORE1.17103.50
0711SODANKYLA67.2926.32
0624SOFIA42.4123.19
0222SOTTENS46.497.21
8172SOUTH GEORGIA-54.15323.55
8816SOUTH UIST57.15352.76
1517SVERDLOVSK56.5161.07
1080SYOWA STATION-69.0039.35
5354TAHITI-17.56210.39
3032TAIPEI24.95121.22
7047TALARA-4.63278.75
0134TAMANRASSET22.795.53
1254TANANARIVE-18.5547.31
5354TARAVAO-17.56210.39
1724TASHKENT41.2069.18
1124TBILISI42.0944.71
1327TEHRAN35.4051.26
3355TENNANT CREEK-19.40134.10
4182TERRA NOVA BAY-74.45164.30
7307THULE77.48290.83
1941THUMBA8.5376.87
1305TIKHAJA BAY80.3352.80
2040TIRUCHIRAPELLI10.4878.41
3209TIXIE BAY71.58128.48
3527TOKYO35.42139.46
2117TOMSK56.4784.93
0025TORTOSA40.480.31
3755TOWNSVILLE-19.16146.48
7540TRINIDAD10.30298.85
1941TRIVANDRUM8.5376.87
0510TROMSO69.6618.94
0455TSUMEB-19.1317.42
7458TUCUMAN-26.49294.87
0415UPPSALA50.9017.35
7372USHUAIA-54.47291.80
6028VANDENBURG AFB34.43239.67
3546VANIMO-2.40141.20
2784VOSTOK-78.45106.87
3522WAKKANAI45.25141.40
7126WALLOPS ISLAND37.52284.73
7125WASHINGTON38.85282.97
2960WATHEROO-30.32115.88
4712WELLEN66.13190.17
6329WHITE SANDS32.22253.77
2878WILKES-66.17110.32
6620WINNIPEG49.47265.71
3460WOOMERA-31.31137.10
3214YAKUTSK62.02129.72
3329YAMAGAWA31.12130.39
3622YUZHNO-SAKHALINSK46.95142.72

Qualifying Letters:

  • A - Less than. Used only when fbEs is deduced from foEs because total blanketing of higher layers is present.
  • D - Greater than
  • E - Less than
  • I - Missing values has been replace by an interpolated value.
  • J - Ordinary component characteristic deduced from the extraordinary component.
  • M - Interpretation of measurement questionable because ordinary and extraordinary components are not distinguishable. Used with descriptive letter which shows why components are not distinguishable.
  • O - Extraordinary component characteristic deduced from the ordinary component.
  • T - Value determined by a sequence of observations, the actual observation being inconsistent or doubtful.
  • U - Uncertain or doubtful numerical value.
  • Z - Measurement deduced from the third magneto-electronic component.

Descriptive Letters:

  • A - Measurement influenced by, or impossible because of, the presence of a lower then layer, for example, ES.
  • B - Measurement influenced by, or impossible because of, absorption in the vicinity of fmin.
  • C - Measurement influenced by, or impossible because of, any non-ionospheric reason.
  • D - Measurement influenced by, or impossible because of, the upper limit of the normal frequency range.
  • E - Measurement influenced by, or impossible because of, the lower limit of the normal frequency range.
  • F - Measurement influenced by, or impossible because of, the presence of spread echoes.
  • G - Measurement influenced by, or impossible because the ionisation density of the reflecting layer is too small to enable it to be made accurately.
  • H - Measurement influenced by, or impossible because of, the presence of stratification.
  • K - Presence of a particle E layer.
  • L - Measurement influenced by, or impossible because the trace has no sufficiently definite cusp between the layers.
  • M - Interpretation of measurement questionable because ordinary and extraordinary components are not distinguishable. Used when interpretation is doubtful and a qualifying letter needed for other reasons (e.g., U, D, E).
  • N - Conditions are such that the measurement cannot be interpreted.
  • O - Measurement refers to the ordinary component.
  • P - Measurement influenced by, or impossible because of, the presence of polar spurs.
  • Q - Measurement influenced by, or impossible because of, the presence of range spread.
  • R - Measurement influenced by, or impossible because of, attenuation in the vicinity of the critical frequency.
  • S - Measurement influenced by, or impossible because of, interference or atmospherics.
  • T - Value determined by a sequence of observations, the actual value or observation being inconsistent or doubtful.
  • V - Forked trace, which may influence the measurement.
  • W - Measurement influenced by, or impossible because the echo lies outside the height range recorded.
  • X - Measurement refers to the extraordinary component.
  • Y - Lacuna phenomena, severe layer tilt.
  • Z - Third magneto-electronic component present.
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