Accession Number:

AD1101020

Title:

Modeling Amateur Radio Soundings of the Ionospheric Response to the 2017 Great American Eclipse

Descriptive Note:

Journal Article - Open Access

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States

Report Date:

2018-05-29

Pagination or Media Count:

10.0

Abstract:

On 21 August 2017, a total solar eclipse traversed the continental United States and caused large-scale changes in ionospheric densities. These were detected as changes in medium-and high-frequency radio propagation by the Solar Eclipse QSO Party citizen science experiment organized by the Ham Radio Science Citizen Investigation hamsci.org. This is the first eclipse-ionospheric study to make use of measurements from a citizen-operated, global-scale HF propagation network and develop tools for comparison to a physics-based model ionosphere. Eclipse effects were observed - 0.3 hr on 1.8 MHz, - 0.75 hr on 3.5 and 7 MHz, and - 1 hr on 14 MHz and are consistent with eclipse-induced ionospheric densities. Observations were simulated using the PHaRLAP raytracing toolkit in conjunction with the eclipsed SAMI3 ionospheric model. Model results suggest 1.8, 3.5, and 7 MHz refracted at h 125 km altitude with elevation angles theta 22 degrees, while 14 MHz signals refracted at h 125 km with elevation angles theta 10 degrees

Subject Categories:

  • Atmospheric Physics
  • Astronomy
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE