Proposal Identification No.: T2698 Date Received: 2011-Nov-10 20:36:34 Technical Page Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Urgent Terrestrial Aeronomy Radar Mesosphere 24 Hours 2 Electron Line Measurements at Arecibo: Electron Temperature and Collision Frequency ABSTRACT: While typical incoherent scatter (IS) measurements focus on the ion contributions to the IS ...

... 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. ...