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Proposal Identification No.:

P3031 Arecibo Observatory

Date Received: 2015-Sep-01 14:42:57 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2015. This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Pulsars 46 46

About an hour less than 100 GB

Pulse-Sequence Polarimetry of Selected Arecibo Pulsars

We propose to continue our current programs with new targeted, sometimes lengthy polarimetric observations on selected faster and millisecond pulsars. The new observations will pursue beamform characterizations, moding phenomena, supplement our studies of core emission, study bistability and drifting effects with the ultimate aim of developing candidates for simultaneous X-ray/radio campaigns, and expand identification of the physical (X/O) propagation modes. We will also push our observations and analyses, including microstructure and intensity dependence to faster pulsars, document moding and measure new RMs. Given our past success and the unique significance of polarimetric pulse-sequence measurements made with the Arecibo telescope, we propose observations significant both immediately for the authors and their students as well the larger pulsar-emission community. We request 46 hours each during the next two cycles of which 70% (30 hours) would be in the 18-21-hour RA region. Outreach Abstract: This proposed set of observations continues a multi-year effort to document and analyze the single-pulse behaviors of the brighter pulsars in the Arecibo sky. Radio pulsars are fascinating ob jects with highly individual phenomena such as distinct behaviors or modes, subpulses that '`drift" from pulse to pulse, puzzling apparent cessations of emission called nulls, and intensity-dependent effects that help to show us how pulsars work physically. We have attempted to understand these effects in terms of a '`carousel" of small emission beams that turn through our sightline over a number of rotations of the pulsar. We also are probing the characteristics of the central core emission that seems to reflect the most basic function of the pulsar "engine". Through this and other means, the overall purpose of the pro ject is to better understand these complex pulsar phenomena in physical terms.

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Name Joanna Rankin Dipanjan Mitra

Institution Physics Dept., versity of Verm Physics Dept., versity of Verm

Uniont Uniont

E-mail Joanna.Rankin@uvm.deu Dipanjan.Mitra@uvm.edu

Phone 802/656-0051 802/656-2644

Student

Additional Authors
Joel M. Weisberg, Carleton College Casey Brinkman-Traverse, UVM Haley Wahl, UVM Geoffrey A. E. Wright, University of Manchester

This work is not part of a thesis.

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Section I I - Time Request
The following times are in LST. For these observations night-time is preferred.

Begin ­ End Interval­Interval 13 18 17 17 ­ ­ ­ ­ 18 21 22 23

Days Needed at This Interval 2 3 3 2

Time Constraints (Must Be Justified in the Prop osal Text) We can use scheduled intervals down to about an hour or so. Hector Hernandez seems to have found our program convenient at times to schedule around other pro jects that require more fixed timings. Given our need for 18-20H Galaxy time, we expect that our pro ject would often need to be inserted into a "patchwork" of other pro jects. For our longer rise-to-set observations, we would address specific requests to Hector Hernandez and then see whether he was able to grant them.

Next Semester Time Request
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Begin ­ End Interval­Interval 13 18 17 17 ­ ­ ­ ­ 18 21 22 23

Days Needed at This Interval 2 3 3 2

Time Constraints (Must Be Justified in the Prop osal Text) We can use scheduled intervals down to about an hour or so. Hector Hernandez seems to have found our program convenient at times to schedule around other pro jects that require more fixed timings. Given our need for 18-20H Galaxy time, we expect that our pro ject would often need to be inserted into a "patchwork" of other pro jects. For our longer rise-to-set observations, we would address specific requests to Hector Hernandez and then see whether he was able to grant them.

Section I I I - Instruments Needed
L-wide 327

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned

This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

Section V - Observing List Target List

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