Welcome to the Arecibo Observatory Data Archive


The Arecibo Observatory contains data from 3 main sciences: Radio Astronomy, Planetary Radar and Amospheric Sciences. The main source of the data obtained was the 305 meter and respective instruments, including the ALFA (Arecibo L-band Feed Array), Heating Facility and L/S/X Bands.

The Principal Investigators of successful proposals for time on Arecibo Observatory have exclusive access to their scientific data for the duration of a proprietary period, normally 18 months, after which the data becomes available to the community at large. Please read the AO Data Access Policy statement for more information, along with the relevant FAQs.

Browsing the Arecibo Archive does not require authentication. Please acknowledge the use of archive data in any publication.

Through this portal, you can browse the proposals and its data. To access the data, please browse the desired proposal and follow the link to Request Data. The data available is mostly in RAW formats.


Radio Astronomy is the study of radio waves produced by a multitude of astronomical objects such as Sun, planets, pulsars, stars, star-forming regions, gas clouds, galaxies, supernova remnants, etc.

Planetary Radar The Arecibo Observatory was the world's most powerful planetary radar system. The 305 meter Arecibo telescope equipped with a 1 MW transmitter at S-band (12.6 cm, 2380 MHz) was used for studies of small bodies in the solar system, terrestrial planets, and planetary satellites including the Moon.

Atmospheric Sciences Is the investigation of the earth's gaseous envelope. The Arecibo Radio Telescope can measure the growth and decay of disturbances in ionosphere (altitudes above 30 miles). The "big dish" is also used to study plasma physics processes in the electrically charged regions where radio waves are influenced most.