Proposal Identification No.: T2573 Date Received: 2010-Jan-29 20:19:07 Technical Page Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Tracers of atmospheric gravity waves (GWs) have been observed in the Arecibo thermosphere using a very sensitive measurement of electron density afforded by the incoherent scatter plasma line [2'"4]. ...

... 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. ...