S.  Cerwin, Collins, K. V., Joshi, D., and Frissell, N. A., ?Estimation of Ionospheric Layer Height Changes From Doppler Frequency and Time of Flight Measurements on HF Skywave Signals?, HamSCI Workshop 2021. HamSCI, Scranton, PA (Virtual), 2021.

N. A.  Frissell, Joshi, D., Romanek, V. I., Collins, K. V., Montare, A., Kazdan, D., Gibbons, J., Engelke, W. D., Atkison, T., Kim, H., Cowling, S. H., McDermott, T. C., Ackermann, J., Witten, D., Madey, J., H. Silver, W., Liles, W., Cerwin, S., Erickson, P. J., Miller, E. S., and Vierinen, J., ?HamSCI Personal Space Weather Station (PSWS): Architecture and Current Status?, in NSF CEDAR (Coupling, Energetics, and Dynamics of Atmospheric Regions), Virtual, 2021.

V. I.  Romanek, Frissell, N. A., Joshi, D., Liles, W., Trop, C., Collins, K., and Perry, G., ?HF Doppler Observations of Traveling Ionospheric Disturbances in a WWV Signal Received with a Network of Low-Cost HamSCI Personal Space Weather Stations?, in NSF CEDAR (Coupling, Energetics, and Dynamics of Atmospheric Regions), Virtual, 2021.

D.  Joshi, Frissell, N. A., Liles, W., Vierinen, J., and Miller, E. S., ?Mid-latitude Irregularities in the Early Results from the Ionospheric Sounding Mode Using Chirp Ionosondes of Opportunity for the HamSCI Personal Space Weather Station?, HamSCI Workshop 2021. HamSCI, Scranton, PA (Virtual), 2021.

D.  Joshi, Frissell, N. A., Liles, W., and Vierinen, J., ?Observations of Mid-latitude Irregularities Using the Oblique Ionosonde Sounding Mode for the HamSCI Personal Space Weather Station?, in NSF CEDAR (Coupling, Energetics, and Dynamics of Atmospheric Regions), Virtual, 2021.

N. A.  Frissell, Sanchez, D. F., Perry, G. W., Joshi, D., Engelke, W. D., Thomas, E. G., Coster, A., Erickson, P. J., J. Ruohoniemi, M., and Baker, J. B. H., ?Sources of Large Scale Traveling Ionospheric Disturbances Observed using HamSCI Amateur Radio, SuperDARN, and GNSS TEC?, in NSF CEDAR (Coupling, Energetics, and Dynamics of Atmospheric Regions), Virtual, 2021.

V. I.  Romanek, Frissell, N. A., Joshi, D., Liles, W., Collins, K., Gibbons, J., and Kazdan, D., ?A Survey of HF Doppler TID Signatures Observed Using a Grape in New Jersey?, HamSCI Workshop 2021. HamSCI, Scranton, PA (Virtual), 2021.