ETが電話をかけてきたとき、私たちはなりすまされていないと確信できるだろうか?(When ET calls, can we be sure we’re not being spoofed?)


2023-07-17 カリフォルニア大学バークレー校(UCB)



ナローバンド電波SETIにおける星間シンチレーションの検出について On Detecting Interstellar Scintillation in Narrowband Radio SETI

Bryan Brzycki, Andrew P. V. Siemion, Imke de Pater, James M. Cordes, Vishal Gajjar, Brian Lacki, and Sofia Sheikh
The Astrophysical Journal  Published 2023 July 17
DOI: 10.3847/1538-4357/acdee0

Figure 8.


To date, the search for radio technosignatures has focused on sky location as a primary discriminant between technosignature candidates and anthropogenic radio frequency interference (RFI). In this work, we investigate the possibility of searching for technosignatures by identifying the presence and nature of intensity scintillations arising from the turbulent, ionized plasma of the interstellar medium. Past works have detailed how interstellar scattering can both enhance and diminish the detectability of narrowband radio signals. We use the NE2001 Galactic free electron density model to estimate scintillation timescales to which narrowband signal searches would be sensitive, and discuss ways in which we might practically detect strong intensity scintillations in detected signals. We further analyze the RFI environment of the Robert C. Byrd Green Bank Telescope with the proposed methodology and comment on the feasibility of using scintillation as a filter for technosignature candidates.