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

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dc.contributor.authorFrissell, N. A.en
dc.contributor.authorKatz, J. D.en
dc.contributor.authorGunning, S. W.en
dc.contributor.authorVega, J. S.en
dc.contributor.authorGerrard, Andrew J.en
dc.contributor.authorEarle, Gregory D.en
dc.contributor.authorMoses, M. L.en
dc.contributor.authorWest, M. L.en
dc.contributor.authorHuba, J. D.en
dc.contributor.authorErickson, P. J.en
dc.contributor.authorMiller, E. S.en
dc.contributor.authorGerzoff, R. B.en
dc.contributor.authorLiles, W.en
dc.contributor.authorSilver, H. W.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2019-09-05T17:12:01Zen
dc.date.available2019-09-05T17:12:01Zen
dc.date.issued2018-05-28en
dc.description.abstractOn 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.en
dc.description.notesNAF acknowledges the support of NSF Grant AGS-1552188/479505-19C75. K<INF>p</INF> and DST indices were obtained from the Kyoto WDC. F10.7 data were accessed through the OMNI database at the NASA Space Physics Data Facility. GOES data are provided by NOAA SWPC. RBN data are provided by reversebeacon.net, with thanks to F. Ceglia, P. Smith, and R. Williams. We thank the global amateur radio community and the ARRL for making the SEQP possible. The results published in this paper were obtained using the HF propagation toolbox, PHaRLAP, created by Manuel Cervera, Defence Science and Technology Group, Australia (manuel.cervera@dsto.defence.gov.au). This toolbox is available by request from its author. SAMI3 outputs are available by contacting J. Huba at huba@nrl.navy.mil. We acknowledge the use of the Free Open Source Software projects used in this analysis: Ubuntu Linux, python, matplotlib, NumPy, SciPy, pandas, and others. NAF thanks R. M. Frissell and L. J. Lanzerotti for helpful discussions.en
dc.description.sponsorshipNSF [AGS-1552188/479505-19C75]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2018GL077324en
dc.identifier.eissn1944-8007en
dc.identifier.issn0094-8276en
dc.identifier.issue10en
dc.identifier.urihttp://hdl.handle.net/10919/93402en
dc.identifier.volume45en
dc.language.isoenen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectsolar eclipseen
dc.subjectionosphereen
dc.subjectamateur radioen
dc.subjectcitizen scienceen
dc.subjectham radioen
dc.subjectHF propagationen
dc.titleModeling Amateur Radio Soundings of the Ionospheric Response to the 2017 Great American Eclipseen
dc.title.serialGeophysical Research Lettersen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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