Welcome to the Arecibo Aeronomy Database. This site provides access to Arecibo World Day data from 1986 to the present.

There are 5 types of data currently available:

• High Resolution E-F Region data obtained using barker-code, typically covering the range from 60 to 550km. This allows the measurement of electron density at 600-m altitude resolution.
• F-Region data with a time resolution of 2 minutes and a height resolution of 37km, typically covering the range from 140-660km.
• Topside Region data with altitude resolution comparable to that of the F Region, covering the range from ~250-3000km.
• E-Region Winds derived from ISR data with a time resolution of 2 minutes and a height resolution of 1.2km, typically covering the range from 90-160km.
• 630-nm atomic oxygen measurements from the Fabry-Perot interferometer with a magnetic declination angle varying between -9.4 to -10.4 degrees and an inclination angle varying between 48.8 and 47.9 degrees with an approximate emission height of 300km. Go here for more details.
• Potassium (K) densities and temperatures from Lidar measurements.

A variety of dynamic online plots, depending on the region, can be generated on the fly. The following plot types are currently available:

• F Region (MRACF)
  • H+ Concentrations
  • He+ Concentrations
  • Electron Densities
  • Ion Temperatures
  • Electron Temperatures
  • Line of Sight Velocities
  • Vector Velocities (Geographic and Geomagnetic coordinates)
• E-F Region (Power profiles)
  • High Resolution Electron Densities
• Topside Region
  • H+ Concentrations
  • He+ Concentrations
  • Electron Densities
  • Ion Temperatures
  • Electron Temperatures
  • Line of Sight Velocities
• E-Region Winds
  • Eastward
  • Northward
• 630-nm FPI Winds
  • Meridional
  • Zonal
  • Vertical
• Lidar Data
  • Densities
  • Temperatures

Data files, images, and the code to read the datafiles can be downloaded. The images are made on the fly using the Matlab webserver. Please be patient when generating images.

Please see Rules of the Road for information on publishing and using data obtained here.

Please see the World Day Homepage for more information on the ISR data.

Please contact Sixto Gonzalez or Mike Sulzer should you have questions or feedback.