@conference {581,
	title = {Construction and Operation of a HamSCI Grape Version 1 Personal Space Weather Station: A Citizen Scientist{\textquoteright}s Perspective},
	booktitle = {American Geophysical Union Fall Meeting},
	year = {2021},
	month = {12},
	publisher = {American Geophysical Union},
	organization = {American Geophysical Union},
	address = {New Orleans, LA},
	abstract = {<p>Measurement of Doppler shifts of high frequency (HF) radio signals emitted by precision frequency transmitters is a well-established technique for the detection of traveling ionospheric disturbances and other perturbations in the bottomside ionosphere. Because Doppler measurements require minimal instrumentation, this technique naturally lends itself to crowdsourced data collection, and purpose-built instrumentation platforms are desirable in order to maximize consistency and repeatability. However, even the best system only has value if it is used, and a robust and engaged community of citizen scientists is vital to sustaining instrumentation platforms. The Ham Radio Science Citizen Investigation (HamSCI) has developed a prototype, low-cost system for making HF Doppler shift measurements of signals from standards stations such as WWV (Fort Collins, Colorado, USA) and CHU (Ottawa, Ontario, Canada). This system, known as the Personal Space Weather Station Grape Version 1, consists of a low intermediate frequency (IF) mixer board, GPS disciplined oscillator, and Raspberry Pi. In collaboration with funded project scientists and engineers, volunteer HamSCI community members developed instructions for building and operating a Grape Version 1 on the HamSCI website. In this presentation, we explain the process for constructing a Grape Version 1 and discuss the experiences of volunteers who have built and are now operating this system. We also discuss preliminary data from these stations, which show dramatic Doppler shifts during sunrise and sunset and during solar events. Concurrent data from multiple proximal stations show shared features and can be used for validation. These stations constitute the first iteration of the Personal Space Weather Station network.</p>
},
	url = {https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/845691},
	author = {Hobart, Joseph R. and Farmer, James O. and Mikitin, Gary and Waugh, David and Benedict, Robert and Cerwin, Stephen A. and Collins, Kristina V, and Kazdan, David and Gibbons, John and Romanek, Veronica I. and Frissell, Nathaniel A.}
}
@proceedings {578,
	title = {HF Doppler Observations of Traveling Ionospheric Disturbances in the WWV Signal Received with a Network of Low-Cost HamSCI Personal Space Weather Stations},
	year = {2021},
	month = {09/2021},
	publisher = {ARRL-TAPR},
	address = {Virtual},
	url = {https://youtu.be/kVY3E3e--_I?t=3495},
	author = {Romanek, Veronica I. and Frissell, Nathaniel A. and Joshi, Dev Raj and Liles, William and Trop, Claire and Collins, Kristina and Perry, Gareth W.}
}
@conference {580,
	title = {HF Doppler Observations of Traveling Ionospheric Disturbances in the WWV Signal Received with a Network of Low-Cost HamSCI Personal Space Weather Stations},
	booktitle = {American Geophysical Union Fall Meeting},
	year = {2021},
	month = {12},
	publisher = {American Geophysical Union},
	organization = {American Geophysical Union},
	address = {New Orleans, LA},
	abstract = {<p>Traveling Ionospheric Disturbances (TIDs) are quasi-periodic variations in ionospheric electron density that are often associated with atmospheric gravity waves. TIDs cause amplitude and frequency variations in high frequency (HF, 3-30 MHz) refracted radio waves. We present observations of TIDs made with a network of Ham Radio Science Citizen Investigation (HamSCI) Low-Cost Personal Space Weather Stations (PSWS) with nodes located in Pennsylvania, New Jersey, and Ohio. The TIDs were detected in the Doppler shifted carrier of the received signal from the WWV frequency and time standard station near Fort Collins, CO. Using a lagged cross correlation analysis, we demonstrate a method for determining TID wavelength, direction, and period using the collected WWV HF Doppler shifted data.</p>
},
	url = {https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/888443},
	author = {Romanek, Veronica I. and Frissell, Nathaniel A. and Joshi, Dev Raj and Liles, William and Trop, Clair and Collins, Kristina and Perry, Gareth W.}
}
