NATIONAL ASTRONOMY AND IONOSPHERE CENTER . ... Astronomy . ... Dr. Jonathan Friedman is currently the Director of the Puerto Rico Photonics Institute as well as a Senior Research Associate in Space and Atmospheric Sciences at the Arecibo Observatory. ... The Universidad Metropolitana (UMET) has established the Puerto Rico Photonics Institute (PRPI) in their School of Environmental Studies graduate campus in Barceloneta, PR. Two focus areas of PRPI are remote sensing and aerospace photonics. ...
... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...