@misc{indiciae3149e2aaf23d,
  title = {The dynamic F2-layer over Arecibo},
  author = {Ganguly, S. and Walker, J. C. G. and Rishbeth, H.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800063664},
  note = {Source identifier: 19800063664}
}