Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/MitratagP2532tp.pdf Дата изменения: Tue Oct 6 21:25:17 2009 Дата индексирования: Fri Apr 9 08:48:43 2010 Кодировка: Поисковые слова: запрещенные спектральные линии

Proposal Identification No.:

P2532

Date Received:

2009-Oct-02 10:17:38

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT:
Recently Mitra et al. (2009) have shown that occasionally single pulses are highly linearly polarized, having a sign changing circular and its polarization position angle following locally the mean position angle traverse. They argue that this is a typical signature of curvature radiation in vacuum. However, theoretically only the extraordinary mode can escape from the pulsar magnetosphere preserving its vacuum like properties. This is in contradiction with observations of circular polarization and OPM in pulsar radiation, where both extraordinary and ordinary mode need to be present. Further sensitive single pulse polarimetry is essential to understand the origin of circular and OPM in pulsars. Mitra et. al.'s single pulses were associated only with the primary (stronger) polarization mode, and hence an important question is if such single pulses are present in the secondary (weaker) polarization modes. Also a key to understand the pulsar emission process lie in how the smaller units of emission average to form these highly polarized single pulses. With an aim to answer these questions we propose to do a systematic survey of high time resolution single pulse polarization of bright pulsars. The Arecibo telescope is uniquely suited for this purpose due to it high sensitivity and available backends that can yield high time resolution data. We request 40 hours of observations, with 20 hours each at P and L band, to observer 20 strong pulsars.

Regular Pulsars Galactic 40 Hours 3-4 hours

A survey of high time resolution single pulse absolute polarimetry of pulsars: Probing the coherent radio emission problem

Name Dipanjan Mitra

Institution National Centre for Radio Astrophysics, TIFR

E-mail dmitra@ncra.tifr.res.in

Phone +91 25719247

20

Student no

Remote Observing Request

X

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

Instrument Setup
1


L-wide

327

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

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.

2