Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh54a..01i&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH54A-01
Astronomy and Astrophysics
Astrophysics
[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory, [7924] Space Weather / Forecasting
Scientific paper
Predicting solar magnetic activity is one of the most important problems of solar and space physics. Helioseismology allows us to probe conditions inside the Sun by observing acoustic oscillations on the solar surface. In this study, we analyze Doppler observations from the MDI and HMI instruments on SOHO and SDO spacecraft using a time-distance helioseismology technique specifically developed for measuring acoustic travel time anomalies caused by perturbations in the deep interior. We have detected strong perturbations associated with emerging active regions at a depth of about 60Mm, about 1-2 days before these regions are formed in the photosphere. We compare our results with numerical simulation models of magnetic flux emergence, discuss implications for solar magnetism studies, and suggest potential applications for space weather forecast.
Ilonidis Stathis
Kosovichev Aleksandr G.
Zhao Jun
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