|Artist's conception of the completed array, showing the 27-m antennas in the foreground, and the central array of 2-m antennas in the distance. The new EOVSA control building is visible in the background on the right.
The New Jersey Institute of Technology (NJIT) is now embarking on a major expansion of OVSA, funded by NSF using American Recovery and Reinvestment Act (ARRA) funds. The project expands OVSA from its current complement of 7 antennas to a total of 15 by adding 8 new antennas, and replaces the existing control systems, wiring, and signal processing with modern, far more capable and reliable systems based on newly developing technology. In so doing, we will create a university-led community facility that will address a broad range of new science that will serve the scientific community. The project will support that community by providing open data access and software tools for analysis of the data, to exploit synergies with on-going solar research in other wavelength bands. The project will result in a world-class facility for scientific research at microwave radio frequencies (1-18 GHz) in areas of important national interest, such as understanding the Sun's influence on the Earth and near-Earth space environment—a subject broadly termed Space Weather. The solar science to be addressed focuses on the magnetic structure of the solar corona, on transient phenomena resulting from magnetic interactions, including the sudden release of energy and subsequent particle acceleration and heating, and on space weather phenomena. The project also includes an exciting program of targeted astronomical science. The non-solar science exploits the large amount of available observing time when the array is not used for solar work, to do search, follow-up, and monitoring of transient radio astronomical sources. The project will be completed in time to provide solar-dedicated observations during the upcoming solar maximum in 2013 and beyond.
The range of science to be conducted with the Expanded OVSA is broad and unique. Check out the science page for more on each topic.
- Magnetic and Plasma Structure Above Active Regions MORE...
- Coronal Magnetography
- Temperature, Density, Nonthermal Electrons
- Flaring Loops and Particle Acceleration in Solar Flares MORE...
- Electrons and Magnetic Fields in Flaring Loops
- Dynamic Imaging and Turbulence
- Drivers of Space Weather MORE...
- F10.7 Images
- Eruptive Events
- Night-Time Observations of Variable and Transient Sources MORE...
- Long Duration Radio Transients (LDRTs)
The OVSA Expansion project will make use of recent developments in broadband analog and digitial systems being considered for the Frequency Agile Solar Radiotelescope (FASR). These include broadband optical links to transfer the entire 1-18 GHz radio frequency (RF) signal directly to the control building, and the use of a 16-antenna, dual-polarization spectral line correlator using CASPER technology.
About the Instrument
The OVSA Expansion calls for a complete redesign of the array, adding 8 new 2-m antennas, and moving the 5 existing 2-m antennas to new locations. These 13 antennas provide 78 baselines for imaging. The two 27-m antennas will be completely refurbished and modernized with new control systems and cooled receivers, for both night-time science and calibration of the array. The maximum baseline will grow to more than 1.5 km, for a typical resolution (varies by time of day and season) of about 60"/nGHz.
Ground breaking on the array formally started Sept. 14, 2011. Click MORE... above to see some images of the progress on construction of the array.
Focus Brightness Test
Meetings and Presentations
Click below to access presentations about the array and its design
Kickoff Meeting 2010 Oct 25-27
Co-DR Meeting 2011 Apr 25-27
Technical Design Meeting 2011 Nov 07-09
Preliminary Design Review Meeting 2012 Mar 15-17
Prototype Review Meeting 2012 Sep 24-26