EOVSA - Home Page Toggle navigation Home About OVSA EOVSA OVRO-LWA OVSA Data OVSA Data Policy OVSA Data Request EOVSA Data Products EOVSA Data Browser EOVSA Flare List OVRO-LWA Data Products OVRO-LWA Data Query Today's Observing Status Documentation Our People Other Pages EOVSA github Welcome to the Owens Valley Solar Arrays Latest EOVSA Spectrogram Latest OVRO-LWA Spectrogram Latest OVRO-LWA Images Latest SDO/AIA 171 Image EOVSA Data Browsing and using EOVSA data products. Direct Me EOVSA Flare List Query EOVSA flare list and download data products. Direct Me OVRO-LWA Solar Data Description of OVRO-LWA solar data products and their usage. Direct Me Query OVRO-LWA Data Browsing and downloading OVSA-LWA solar data products. Direct Me OVSA Science Highlights Read latest OVSA science highlights. Direct Me OVSA Publications Publications that use OVSA data. Direct Me Observing Status Array status and latest spectrograms/images. Direct Me Join Us Join for latest OVSA updates and communications. Join Slack Subscribe Emails Latest News New OVSA Science Highlight on EOVSA observation of a "cold" flare, contributed by Gregory Fleishman (NJIT). New OVSA Science Highlight on two phases of impulsive SEP acceleration, contributed by Meiqi Wang (NJIT). New OVSA Science Highlight on microwave precursor of a major solar eruption, contributed by Yuankun Kou (Nanjing University). The 2025 OVSA Summer School and Workshop will be held at the New Jersey Institute of Technology from July 21 to July 23, 2025. We are accepting registrations, abstract submissions, and financial support applications until June 30. See this stunning radio movie of the April 8, 2024 solar eclipse obtained by the Long Wavelength Array at the Owens Valley Radio Observatory (OVRO-LWA)! Overview Owens Valley Solar Arrays (OVSA) is a university-led radio facility dedicated to solar astrophysics and space weather research. Located in the Owens Valley Radio Observatory (OVRO) near Big Pine, California, the operations of OVSA include the Expanded Owens Valley Solar Array (EOVSA) observing in the microwave regime (1-18 GHz), as well as the solar and space weather aspects of the newly commissioned Long Wavelength Array at the Owens Valley Radio Observatory (OVRO-LWA), which observes in the meter-decameter wavelength regime (13-87 MHz). EOVSA operations are led by the New Jersey Institute of Technology (NJIT), joined by the California Institute of Technology (Caltech) and University of California, Berkeley. It makes daily observations of the Sun at microwave frequencies (1-18 GHz) with simultenous imaging and broandband spectroscopy, addressing a broad range of scientific topics in the low solar atmosphere. EOVSA was the result of a major expansion of our legacy array, a project funded by NSF using American Recovery and Reinvestment Act (ARRA) funds and completed in 2017. Currently, EOVSA is being upgraded again by replacing all the remaining old equatorial antennas with new azimuth-altitude-mounted antennas, adding two new antennas to the array, and equipping all antennas with new-generation quad-ridge flare feed horns. The upgrade project (EOVSA-15), supported by the NSF Major Research Instrumentation (MRI) Program (AGS-2320478), will create a 15-element array with full imaging spectropolarimetry capabilities and enhanced imaging performance. The upgrade project is expected to complete in 2026. OVRO-LWA is a multi-institutional project led by Caltech, with its operations relevant to the solar and space weather aspects led by NJIT. After its recent completion (funded via NSF's MRI program AST-182784), the array now consists of 352 cross-dipole antennas spanning a footprint of 2.4 km. OVRO-LWA is a highly versatile, multi-use system. It observes the full-sky at meter-decameter wavelengths (13-87 MHz), with science topics spanning from solar and space weather science to exoplanets and cosmology. For solar observing, this wavelength regime probes the Sun's "middle corona," loosely defined as the region between ~1.5 and 10 solar radii. A public release of the OVRO-LWA solar data is expected in the summer of 2025. The OVSA project aims to support the 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, and to train next-generation scientists. OVSA operations are mainly supported by NSF under the Geospace Facilities program through NSF Award AGS-2436999, and receives additional support from NASA's HSO Data Support program under grant 80NSSC20K0026. Learn More Science The range of science to be conducted with OVSA is broad and unique. A list of publications that utilized OVSA data is available at this NASA/ADS Library. Check out the science page for more on each topic. Magnetic and Plasma Structure Above Active Regions Coronal Magnetography Coronal Temperature, Density, and Abundance Magnetic Energy Release and Particle Acceleration Measuring Magnetic Fields in Solar Flares and Coronal Mass Ejections Particle Acceleration and Transport by Flares and Coronal Shocks Coronal Heating and Solar Wind Acceleration Weak Microwave Coronal Transients Weak Radio Bursts in Middle Corona Drivers of Space Weather Near-realtime Mapping of Coronal Mass Ejections in Radio Realtime Observations of Solar Radio Bursts Daily F10.7 Images Learn More Operations of EOVSA are supported by the National Science Foundation under grant No. AGS-2436999. Additional support is provided by NASA under grant No. 80NSSC20K0026. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation and NASA. Copyright © EOVSA Website 2025