SWENET Software Infrastructure Space Weather Data Specification ...

2.4 NGDC
Project: Space Weather Pilot Project Coordination and Software Infrastructure Development
Reference: R047rep026_00_07_Data_Specification_(BIRA).doc
eta_max space GmbH, Richard-Wagner-Str. 1, 38106 Braunschweig, Germany
SWENET Software Infrastructure Date: 2004-10-20
Space Weather Data Specification Version: 0.
This section contains historical data from the solar terrestrial physics program at NOAA's National Geophysical Data Center.
2.4.1 Historical Kp and Ap values
Table Name tb_ngdc_kp_ap
Data File ftp.ngdc.noaa.gov\STP\GEOMAGNETIC_DATA\INDICES\KP_AP
External data resources Status: Draft
Comments THREE-HOUR-RANGE INDEX K:
K indices range in 28 steps from 0 (quiet) to 9 (greatly disturbed) with frac-tional parts expressed in thirds of a unit. A K-value equal to 27,
for example, means 2 and 2/3 or 3-; a K-value equal to 30 means 3 and 0/3 or 3 exactly; and a K-value equal to 33 means 3 and 1/3 or 3+.
The arithmetic mean of the K-values scaled at the 13 observatories listed above gives Kp.
EQUIVALENT AMPLITUDE
The a-index ranges from 0 to 400 and represents a K-value converted to a linear scale in gammas (nanoTeslas)--a scale that measures
equivalent disturbance amplitude of a station at which K=9 has a lower limit of 400 gammas.
Column/Index Data Type Modifiers Description Check
id serial key
utc timestamp key UTC date and time
bartels_srn smallint BARTELS SOLAR ROTATION NUMBER--a sequence of 27day
intervals counted continuously from February 8, 1832
bartels_nod smallint NUMBER OF DAY within the Bartels 27-day cycle
kp_00_03 smallint Kp or PLANETARY 3-HOUR RANGE INDEX for 0000 - 0300
UT
kp_03_06 smallint Kp or PLANETARY 3-HOUR RANGE INDEX for 0300 - 0600
UT
kp_06_09 smallint Kp or PLANETARY 3-HOUR RANGE INDEX for 0600 - 0900
UT
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