gov.noaa.ngdc.stp.indices:G00020
eng; USA
utf8
dataset
Justin Mabie
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Space and Terrestrial Weather Specialist
(303) 497-6135
(303) 497-6513
325 Broadway, Mail Code E/GC4
Boulder
CO
80305-3328
USA
Justin.Mabie@noaa.gov
pointOfContact
2015-09-18
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Geomagnetic aa Indices
1957-01-01
publication
First
NOAA National Centers for Environmental Information
publisher
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
publisher
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
originator
Solar-Terrestrial Physics (STP)
'Working Document II'
The geomagnetic aa indices are the continuation of the series beginning in the year 1868. A full description of these indices is given in the International Association of Geomagnetism and Aeronomy (IAGA) Bulletin No 33, which contains them for the years 1868-1967. Descriptions are also given (especially comparisons with am, ap, or Ci indices) in two short papers [Ann. Geoph., 27, 62-70, 1971 and J. Geophys. Res., 77, 6870-6874, 1972]. The aa values form 1968-1975 are contained in the IAGA Bulletin 39. From 1976 onward they are included in IAGA Bulletin 32. Revised aa values for the years 1969-1976 have been distributed in 1979 to the recipients of IAGA Bulletin 32 in the form of loose sheets to be inserted in the Bulletin 39 (1968-1975) and 32f (1976). A graph of these values 1868 - 1979 is published in the 426 Part I issue of Solar-Geophysical Data (SGD) (page 137). Revised aa values for 1968-1977 appear in the 411 Part II February 1977 SGD. Briefly, such three-hourly indices as these, computed from K indices of two antipodal observatories (invariant magnetic latitude 50 degrees), provide a quantitative characterization of the magnetic activity, which is homogeneous through the whole series. Half-daily and daily values give an estimation of the activity level very close to that obtained with "am" indices. Values are in gammas and correspond to the activity level at an invariant magnetic latitude of 50 degrees. The aa indices are computed for: N = daily values for the Northern Hemisphere, S = daily values for the Southern Hemisphere, M = half-daily values of aa indices for the Greenwich day. Letters C and K refer to a classification of the quiet days of the month (C = really quiet, K = quiet but with slightly disturbed three-hourly intervals). The letters on the left refer to the 24-hour Greenwich day, on the right to a period of 48 hours centered on the Greenwich noon. The three-hourly indices aa are available from the appropriate World Data Centers in digital form using the format described in IAGA Bulletin 33.
Solar Wind/Magnetospheric Research
completed
Justin Mabie
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Space and Terrestrial Weather Specialist
(303) 497-6135
(303) 497-6513
325 Broadway, Mail Code E/GC4
Boulder
CO
80305-3328
USA
Justin.Mabie@noaa.gov
pointOfContact
NOT UPDATED
Earth Science > Interior & Crust
EARTH SCIENCE > SOLID EARTH > Geomagnetism > Geomagnetic Indices
theme
NASA/GCMD Earth Science Keywords
Solar Physics
Space Physics
Geomagnetism
Indices
theme
Uncontrolled Keywords
Global
place
NASA/GCMD Location Keywords
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
dataCentre
Global Change Master Directory (GCMD) Data Center Keywords
2020-01-09
publication
9.1
NASA Goddard Space Flight Center, Earth Science Data and Information System
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Global Change Master Directory (GCMD) Keywords
The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
information
custodian
While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
otherRestrictions
Use Constraints: None
otherRestrictions
Access Constraints: No Constraints
eng; USA
geoscientificInformation
-180.000000
180.000000
-90.000000
90.000000
1868-01-01
Observing station type: Geophysical Observatory. Number of sites: 12. European Space Operations Center, German Federal Republic.
ASCII
Justin Mabie
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Space and Terrestrial Weather Specialist
(303) 497-6135
(303) 497-6513
325 Broadway, Mail Code E/GC4
Boulder
CO
80305-3328
USA
Justin.Mabie@noaa.gov
pointOfContact
Depends on the Data Set
Ordering Instructions: Prepay by check, money order or bank card. There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information
4 Days
34.600000
ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/
cdRom
iso9660
repository
NOAA National Centers for Environmental Information
NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
2015-04-22T00:00:00
annually
This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard (version FGDC-STD-012-2002) using the 2012-08-08 version of the FGDC RSE to ISO 19115-2 transform.
Translated from FGDC 2012-10-10T11:06:46-06:00
This record was automatically modified on 2015-09-18 to include references to NCEI where applicable.
NOAA National Centers for Environmental Information
Metadata Specialist
editor
Justin Mabie
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Space and Terrestrial Weather Specialist
(303) 497-6135
(303) 497-6513
325 Broadway, Mail Code E/GC4
Boulder
CO
80305-3328
USA
Justin.Mabie@noaa.gov
pointOfContact