Patrick Boumier (to Alan)
Building GOLF
Alan day2013 June 20
Alan day2013 June 20
IAS + OCA + SAp + Bordeaux Obs. + IAC + UCLA
Caution
Any resemblance to persons living or dead or to scenarii is not purely accidental, but the details were somewhat different… !
2013 June 20 Alan day
Alan day2013 June 20
- Parallels are drawn between the asymmetric resonance profiles observed in global helioseismology and the Fano theory for autoionisation profiles in atomic spectroscopy. .
Resonance profiles in Helioseismology (HS)
Alan day2013 June 20
SoHO/MDI
Alan day2013 June 20
Autoionisation profiles in atomic spectroscopy (AS)
Rydberg series
Fano's expression(Connerade, 1998):
2013 June 20 Alan day
As invisible as Obelix is always hungry, the two expressions have an identical form !
- Fano HS, if we suppress the term B2 and the non-correlated background, the asymmetry factor q being equivalent to 1/B.
- The asymmetry sign reversal comes naturally from how the system is observed (atomic physics).
• Because he was not happy with the HS profile formula !
- Intoduction of a “correlated background” to explain the sign reversal for B depending on the observable.
- Derived through an expansion in small quantities and the neglect of higher order terms.
valid only in the immediate vicinity of the resonance.
- To which physics the B2 term does correspond ?
i
Alan day2013 June 20
Why did Alan think of a parallel between HS and AS ?
Is there physics behind the formal parallel ?
Alan day2013 June 20
Both situations can be thought of as arising through the mixture of coincident stationary states, one arising from a discrete resonance, the other a “continuum" in the AS language, which is equivalent to “background noise" in the present-day terminology of HS.
We show that the underlying physics of the interaction of a discrete resonance with a correlated continuum is common to both systems.
What can we conclude for Helioseismology ?
- The additional term B2 in the HS fitting formula is unnecessary
AND
-The formula is fundamentally valid on the whole frequency range and can be used to fit all modes to gether
AS
-Thanks to the AS situation we can predict which resonances will interact with which continua and with which other resonances !
Alan day2013 June 20
2013 June 20 Alan day
Even more interesting as far as Physics is concerned:
This works addresses the question whether the two interacting influences of excitation sources and correlated solar background, are really separate independent processes.
Does this work comes from perseverance or from obstinacy ?
• Is Alan an artist ? The art of making people believe he is persevering while he is obstinate/stubborn… (L’art de faire croire à de la persévérance alors qu’il est complètement obstiné/obsédé).
Probably a subtle mixing !
• Obstinacy + perseverance obstiverance• Obstination + persévérance obstivérance
Alan day2013 June 20
Know what ?
Some students gave a nickname to Alan:
Idefix (idée fixe) !
English translation: Dogmatix… !
Idée fixe obstiverance ≠ dogmatism
Alan day2013 June 20
Building GOLF
a relation with Gabriel Ô Lovely Fellow
Alan day2013 June 20
Thank you Alan !