| NSF Org: |
AGS Division of Atmospheric and Geospace Sciences |
| Recipient: |
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| Initial Amendment Date: | February 16, 2006 |
| Latest Amendment Date: | January 21, 2014 |
| Award Number: | 0548260 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
Ilia Roussev
AGS Division of Atmospheric and Geospace Sciences GEO Directorate for Geosciences |
| Start Date: | February 15, 2006 |
| End Date: | December 31, 2014 (Estimated) |
| Total Intended Award Amount: | $454,549.00 |
| Total Awarded Amount to Date: | $504,825.00 |
| Funds Obligated to Date: |
FY 2007 = $111,100.00 FY 2008 = $70,335.00 FY 2009 = $72,189.00 FY 2010 = $124,364.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
18111 NORDHOFF ST NORTHRIDGE CA US 91330-0001 (818)677-1403 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
18111 NORDHOFF ST NORTHRIDGE CA US 91330-0001 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): |
SOLAR-TERRESTRIAL, International Research Collab |
| Primary Program Source: |
0100999999 NSF RESEARCH & RELATED ACTIVIT 01000809DB NSF RESEARCH & RELATED ACTIVIT 01000910DB NSF RESEARCH & RELATED ACTIVIT 01001011DB NSF RESEARCH & RELATED ACTIVIT |
| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
The principal investigator (PI) proposes to develop a science program that integrated the ground based instrumentation and observing facilities of San Fernando Observatory (SFO) with those of National Astronomical Observatory of Japan (NAOJ) and the Solar-B spacecraft (to be deployed in 2006). This program would be integrated into the curriculum of the California State University-Northridge (CSUN) Department of Physics and Astronomy to spur interest in experimental astronomy among undergraduate and graduate students. The proposer also plans to make multi-height magnetic field measurements of emerging sunspots, as well as near-simultaneous deep photospheric and chromospheric magnetic field observations of solar active regions, with Solar-B, the refurbished SFO spectroheliograph, and similar instruments at NAOJ. The ground based, high sensitivity near-infrared (NIR) measurements at SFO and NAOJ would complement the higher spatial resolution observations of Solar-B. As a part of longer-term program, the PI intends to collaborate with the NSF's Advanced Technology Solar Telescope project upon its completion.
This proposal addresses the problem of diminishing manpower in the fields of experimental solar physics and astronomy by exposing undergraduate students to state-of-the-art observational solar physics near the beginning of their careers, motivating their further academic pursuits. The international collaboration would also contribute to the development of a long-term curriculum for experimental astronomy. This effort will play a vital role in enhancing astronomical education in the United States while furthering our understanding of fundamental problems in solar physics, from coronal heating to space-weather prediction. This project will lay a robust foundation for research and education in the field of experimental astronomy while engaging undergraduate and graduate students in active research.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
Eventhough the magnetic field in the sunspots were observed about one hundred ago, the chromospheric field became accessible only recently. The sensity of chromosphere is such thaat there are less collisions leading to non-thermodynamic equilibrium conditions. We have used modern analysis technique to understand the line formation in such conditions, which is used in this work to derive temperature and magnetic field of solar chromosphere.
We have observed sunspots using the Spectropolarimeter for infrared and optical wavelength ranges at the Dunn Solar Telescope during 29 July to 4 August 2013. The data consists of full Stokes profiles in the Ca II 854.2 nm and Fe I 1.56 micron lines. The inversion of these Stokes spectra provides the magnetic, thermal and velocity structure at photospheric and chromospheric heights of sunspots.Our results provide the 3D thermal structure in the super-penumbral canopy of a well rounded sunspot, which was derived by a novel approach for the inversion of Ca II IR spectra. Tracing individual fibrils in the super-penumbral canopy, we find that about half of them form only short loops of a a few Mm length that return to the photosphere in the close surroundings of the sunspot instead of connecting to more remote magnetic network at the outer end of the moat flow. These type of study would be useful to understand the stability and decay of the sunspots.
Last Modified: 03/11/2015
Modified by: Debi Prasad Choudhary
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