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 !