Geomagnetic Kn, Ks, Km Indices
A full description of the indices Kn, Ks, Km is given in a monography,"Indices Kn,
Ks et Km, 1964-1967", edited in 1968 by the Centre National de la Recherche Scientifique,
15 quai Anatole, France, 75007 Paris, which contains these indices for 2964-1967 while
the International Association of Geomagnetism and Aeronony (IAGA) Bulletin NO. 39
contains those for 1959-1963. Yearly computations of these data are published in the
series of IAGA Bulletin No.32. All
of them are available in digital form at the appropriate World Data Center. Briefly, the three-hourly indices Kn and Ks for the Northern and Southern Hemispheres respectively are derived from the K indices of observatories approximately well distributed in latitude and in longitude. The indices are standardized according to the distances of the stations to the auroral zones. The stations are arranged in groups representing a longitude sector in one of the hemispheres (5 in
the Northern Hemisphere, 4 in the Southern). The observatories currently in use are: MGD-Magadan, EYR-Eyrewell, PET-Petropavlovsk, LAU-Lauder, MMB-Memambetsu, CAN-Canberra, POD-Podkammenaya Tunguska, SVE-Sverdlovsk, GNA-Gnangara, NGK-Niemegk, KGL-Kerguelen, CZT-Crozet, HAD-Hartland, HER-Hermanus, OTT-Ottawa, AIA-Argentine Island, FRD-Fredericksburg, NEW-Newport, VIC-Victoria, TUC-Tucson The mean standardized K of each sector is converted into an equivalent amplitude and the
weighted (in longitude) averages and these amplitudes are converted back into Kn and Ks. Km is derived in the same way from am, the average of an and as. Indices an, as and am are expressed in gammas (one gamma equals one nanoTesla) and correspond to the magnetic activity level (as it can be inferred from K indices 0 at an invariant magnetic latitude of 50 degrees. Indices Kn, Ks and Km are expressed in the same units as Kp. Values published in these reports are only
provisional because in some months all observatories used in each longitude sector have not sent K indices at the right time and because K indices of Antarctic Stations have be rescaled at the end of each wintering.
of them are available in digital form at the appropriate World Data Center. Briefly, the three-hourly indices Kn and Ks for the Northern and Southern Hemispheres respectively are derived from the K indices of observatories approximately well distributed in latitude and in longitude. The indices are standardized according to the distances of the stations to the auroral zones. The stations are arranged in groups representing a longitude sector in one of the hemispheres (5 in
the Northern Hemisphere, 4 in the Southern). The observatories currently in use are: MGD-Magadan, EYR-Eyrewell, PET-Petropavlovsk, LAU-Lauder, MMB-Memambetsu, CAN-Canberra, POD-Podkammenaya Tunguska, SVE-Sverdlovsk, GNA-Gnangara, NGK-Niemegk, KGL-Kerguelen, CZT-Crozet, HAD-Hartland, HER-Hermanus, OTT-Ottawa, AIA-Argentine Island, FRD-Fredericksburg, NEW-Newport, VIC-Victoria, TUC-Tucson The mean standardized K of each sector is converted into an equivalent amplitude and the
weighted (in longitude) averages and these amplitudes are converted back into Kn and Ks. Km is derived in the same way from am, the average of an and as. Indices an, as and am are expressed in gammas (one gamma equals one nanoTesla) and correspond to the magnetic activity level (as it can be inferred from K indices 0 at an invariant magnetic latitude of 50 degrees. Indices Kn, Ks and Km are expressed in the same units as Kp. Values published in these reports are only
provisional because in some months all observatories used in each longitude sector have not sent K indices at the right time and because K indices of Antarctic Stations have be rescaled at the end of each wintering.
Cite this dataset when used as a source.
- ID not available.
gov.noaa.ngdc.stp.indices:G01185
Other Access | |
Distribution Formats |
|
Ordering Instructions | Ordering Instructions: Price information is available upon request. Prepay by check, money order or bank card There is a standard handling charge, with additional costs for special handling. Ordering Instruction Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information |
Distributor | Justin Mabie Space and Terrestrial Weather Specialist DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6135 Justin.Mabie@noaa.gov |
Dataset Point of Contact | Justin Mabie Space and Terrestrial Weather Specialist DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6135 Justin.Mabie@noaa.gov |
Time Period | 1983-01-01 to Present |
Spatial Bounding Box Coordinates |
West:-180.000000
East:180.000000
South:-90.000000
North:90.000000
|
Spatial Coverage Map |
Documentation links not available. |
Publication Dates |
|
Edition | First |
Dataset Progress Status | Under development - data is currently in the process of being created |
Data Update Frequency | Monthly |
Purpose | Monitor Geomagnetic Activity |
Use Limitations |
|
Originators |
|
Publishers |
|
Theme keywords | NASA/GCMD Earth Science Keywords
|
Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
|
Place keywords | NASA/GCMD Location Keywords
|
Use Constraints |
|
Access Constraints |
|
Fees |
|
Processing Steps |
|
Last Modified: 2015-09-18
For questions about the information on this page, please email:Justin.Mabie@noaa.gov