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The Tropic of Cancer lies at 23d 26' 22" (23.4394 degrees) north of the Equator and marks the most northerly latitude at which the sun can appear directly overhead at noon. This event occurs at...
Search relevance: 1.00 | Views last month: 22 | Catalog Last Checked: April 21, 2026 at 12:26 PM -
The Global Ensemble Forecast System (GEFS) is a weather forecast model made up of 21 separate forecasts, or ensemble members. The National Centers for Environmental Prediction (NCEP) started the...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: April 12, 2026 at 09:14 PM -
ETOPO5 is a 5 arc-minute global relief model of Earth's surface that integrates land topography and ocean bathymetry. It was built from numerous global and regional data sets. This historical...
Search relevance: 1.00 | Views last month: 17 | Catalog Last Checked: April 21, 2026 at 06:38 AM -
The Space Environment Monitor (SEM) instrument onboard the NOAA POES satellite series and MetOp satellite series measures the flux of energetic ions and electrons at the altitude of the satellite....
Search relevance: 1.00 | Views last month: 12 | Catalog Last Checked: May 05, 2026 at 10:42 PM -
This Climate Data Record (CDR) contains total solar irradiance (TSI) as a function of time created with the Naval Research Laboratory model for spectral and total irradiance (Version 2.1). Version...
Search relevance: 1.00 | Views last month: 11 | Catalog Last Checked: April 12, 2026 at 09:23 PM -
A global data set of land distances from the nearest coastline. NASA's Ocean Biology Processing Group (OBPG) generated this data set using the Generic Mapping Tools (GMT) software package....
Search relevance: 1.00 | Views last month: 7 | Catalog Last Checked: April 21, 2026 at 06:32 AM -
The Global Forecast System (GFS) is a weather forecast model produced by the National Centers for Environmental Prediction (NCEP). Dozens of atmospheric and land-soil variables are available...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: April 12, 2026 at 09:13 PM -
A global data set of ocean distances from the nearest coastline. NASA's Ocean Biology Processing Group (OBPG) generated this data set using the Generic Mapping Tools (GMT) software package....
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: April 21, 2026 at 06:32 AM -
The Global Forecast System (GFS) is a weather forecast model produced by the National Centers for Environmental Prediction (NCEP). Dozens of atmospheric and land-soil variables are available...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: April 12, 2026 at 09:13 PM -
This archive covers two high resolution sea surface temperature (SST) analysis products developed using an optimum interpolation (OI) technique. The analyses have a spatial grid resolution of 0.25...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: April 12, 2026 at 09:13 PM -
This programs derives a table of secular change in magnetic declination for a specified point in the conterminous United States. It utilizes the USD polynomial and the IGRF spherical harmonic...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 04:14 PM -
The World Magnetic Model High Resolution is a more detailed, accurate depiction of the geomagnetic field than the World Magnetic Model (WMM) because it has more coefficients (18,210 instead of...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 04:14 PM -
The Enhanced Magnetic Model (EMM) extends to degree and order 720, resolving magnetic anomalies down to 56 km wavelength. The higher resolution of the EMM results in significantly improved...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 04:13 PM -
The High Definition Geomagnetic Model (HDGM) is a global, high resolution model of the Earth's geomagnetic main and crustal field, providing magnetic field values (total field, dip, and...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 04:14 PM -
Declination is calculated using the current International Geomagnetic Reference Field (IGRF) model. Declination is calculated using the current World Magnetic Model (WMM) or International...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 04:13 PM -
A global data set of ocean distances from the nearest coastline. NASA's Ocean Biology Processing Group (OBPG) generated this data set using the Generic Mapping Tools (GMT) software package....
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: April 21, 2026 at 06:32 AM -
This Climate Data Record (CDR) contains total solar irradiance (TSI) as a function of time created with the NASA NOAA Laboratory for Atmospheric and Space Physics (LASP) (NNL) Version 1 model for...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: April 12, 2026 at 09:27 PM -
A global data set of distances from the nearest coastline. Negative distances represent locations over land (including land-locked bodies of water), while positive distances represent the ocean....
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: April 21, 2026 at 06:32 AM -
The Enhanced Magnetic Model (EMM) extends to degree and order 720, resolving magnetic anomalies down to 56 km wavelength. The higher resolution of the EMM results in significantly improved...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 06, 2026 at 04:13 PM -
EMAG2 is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic measurements. It is a significant update of our previous candidate grid for the World Digital...
Search relevance: 1.00 | Views last month: 3 | Catalog Last Checked: May 06, 2026 at 04:13 PM
