Helioseismology in Space Weather - National Solar Observatory

More documents

Recommendations

Info

Emerging Active RegionsOriginal Paper: Ilonidis, S.,Zhao, J. and Kosovichev, A. , 2011,Science 333,993,“Detection of Emerging Sunspot Regions in the Solar Interior”-11 hoursIlonidis, S.,Zhao, J. and Kosovichev, A. 2012, Proc.Of the 61 st Fujihara Seminar: Progress in solar/stellar physics with helio-and asteroseismology-3 hoursAnalysis of 9 quiet-Sun regions to estimate noiselevel: quiet Sun showed no significant travel-timeperturbations, standard deviation was 3.3,yielding S/N for AR’s 10488 and 8164 4.9 and4.2 respectivelyThese travel-time anomaliescorrespond to very large speeds !!
Emerging Active RegionsHelioseismic holography is applied tosamples of the two populations (preemergenceand without emergence), eachsample having over 100 members, whichwere selected to minimize systematic bias,as described in Leka et al.Birch, A. et al, 2012, ApJ, 762We find that there are statistically significantsignatures (i.e., difference in the means of morethan a few standard errors) in the averagesubsurface flows and the apparent wave speed thatprecede the formation of an active region. Themeasurements here rule out spatially extendedflows of more than about 15 m/s in the top 20Mm below the photosphere over the course of theday preceding the start of visible emergence.These measurements place strong constraints onmodels of active region formation.
Page 1: Helioseismology in Space WeatherIre
Page 4 and 5: Helioseismology of Active RegionTim
Page 6 and 7: Helioseismology of Active RegionsCo
Page 8 and 9: Current Far-side MapsMagnetic field
Page 10 and 11: Input DataSolarMagnetogramDataIncor
Page 12 and 13: • WSA Coronalholes - Whitecontour
Page 14 and 15: F 10.7 Forecasting Using ADAPT(with
Page 16 and 17: Validation of far-side seismic maps
Page 18 and 19: Far-side seismic maps: Next Generat
Page 20 and 21: Flares and subsurface dynamicsTotal
Page 24 and 25: Emerging Active RegionsBirch, A. et
Page 26 and 27: Emerging Active RegionsDeep focusin

Helioseismology in Space Weather - National Solar Observatory

Create successful ePaper yourself

Delete template?

Save as template?