Investigations in Theoretical Astrophysics
{'Code': '03020400', 'Directorate': {'Abbreviation': 'MPS', 'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'Abbreviation': 'AST', 'LongName': 'Division Of Astronomical Sciences'}}
{'SignBlockName': 'Millissa J. Evans', 'PO_EMAI': None, 'PO_PHON': None}
Research in three major areas of theoretical astrophysics will be               carried out.  The areas are:                                                    (i)  Gravitational Lensing:  Several cases of lensing have been                 discovered where the background source is thought to be an                      extended galaxy rather than the more common point-like quasar.                  The characteristics of lensing of extended sources will be                      explored and compared with observations.                                                                                                                        (ii)  Radio Pulsars:  A detailed phenomenological model for the                 birth and evolution of pulsars in the Galaxy will be developed.                 Issues to be considered include (a) the timescale of field decay,               (b) correlation of pulsar velocity with magnetic field, and (c)                 the initial rotation periods of pulsars at birth.                                                                                                               (iii)  Scintillation:  Intensity scintillation due to scattering                occurs in a variety of astronomical situations:  (a)  Radio                     interstellar scintillation, (b) radio interplanetary                            scintillation, (c) optical scintillation in the earth's                         atmosphere, (d) optical scintillation in planetary atmospheres,                 (e) ionospheric scintillation.  A variety of phenomena related to               (a), (b) and (c) will be explored taking advantage of                           similarities in the basic theoretical framework.  Some                          observations, using the solar wind as a scintillation laboratory,               will be carried out.
{'FirstName': 'Ramesh', 'LastName': 'Narayan', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Ramesh Narayan', 'EmailAddress': 'rnarayan@cfa.harvard.edu', 'NSF_ID': '000443270', 'StartDate': '01/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of Arizona', 'CityName': 'TUCSON', 'ZipCode': '85721', 'PhoneNumber': '5206266000', 'StreetAddress': '845 N PARK AVE RM 538', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Arizona', 'StateCode': 'AZ', 'CONGRESSDISTRICT': '07', 'CONGRESS_DISTRICT_ORG': 'AZ07', 'ORG_UEI_NUM': 'ED44Y3W6P7B9', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF ARIZONA', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '121700', 'Text': 'EXTRAGALACTIC ASTRON & COSMOLO'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1988&All=true', 'xml': '8814725.xml'}