English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We perform helioseismic holography on realistic solar convection simulationsand compare the observed travel-time perturbations with the expected traveltimes from the horizontal flows in the simulations computed from forward modelsunder the assumption of the Born approximation. We demonstrate reasonableagreement between the observed and model travel times which reinforces thevalidity of helioseismic holography in the detection of subsurface horizontalflows. From the variation of the signal-to-noise ratio with depth, we concludethat the helioseismic detection of individual flow structures with spatialscales of supergranulation or smaller is not possible for depths below about 5Mm below the surface over time scales less than a day. Approximately half ofthe observed signal originates within the first 2 Mm below the surface. Aconsequence of this is a rapid decrease (and reversal in some cases) of thetravel-time perturbations with depth due to the contribution to themeasurements of oppositely directed surface flows in neighboring convectivecells. This confirms an earlier interpretation of similar effects reported fromobservations.

Helioseismic Holography of Simulated Solar Convection and Prospects for the Detection of Small-Scale Subsurface Flows