Patrick boumier to alan
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Patrick Boumier (to Alan). Building GOLF. 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…  !.

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Patrick Boumier (to Alan)

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Patrick Boumier (to Alan)

Building GOLF

Alan day

IAS + OCA + SAp + Bordeaux Obs. + IAC + UCLA

Alan day


Any resemblance to persons living or dead or to scenarii is not purely accidental, but the details were somewhat different… !

Alan day

  • Parallels are drawn between the asymmetric resonance profiles observed in global helioseismology and the Fano theory for autoionisation profiles in atomic spectroscopy. .

Alan day

Resonance profiles in Helioseismology (HS)


Alan day

Autoionisation profiles in atomic spectroscopy (AS)

Fano's expression

(Connerade, 1998):

Rydberg series

Alan day

As invisible as Obelixisalwayshungry, the two expressions have an identicalform !

- 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).

Alan day

Why did Alan think of a parallel between HS and AS ?

  • Becausehewas not happy with the HS profile formula !

    - Intoduction of a “correlated background” to explain the sign reversal for B depending on the observable.

    - Derivedthrough 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 ?


Alan day

Is there physics behind the formal parallel ?

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.

Alan day

What can we conclude for Helioseismology ?

- The additional term B2 in the HS fitting formula is unnecessary


  • The formula is fundamentally valid on the whole frequency rangeand can be used to fit all modes to gether


  • Thanks to the AS situation we can predict which resonances will interact with which continua and with which other resonances !

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.

Alan day

Does this work comes from perseverance or from obstinacy ?

  • Is Alan an artist ? The art of making people believeheisperseveringwhileheisobstinate/stubborn… (L’art de faire croire à de la persévérance alors qu’il est complètement obstiné/obsédé).

    Probably a subtlemixing !

  • Obstinacy + perseverance obstiverance

  • Obstination + persévérance  obstivérance

Alan day

Know what ?

Some students gave a nickname to Alan:

Idefix (idée fixe)  !

English translation: Dogmatix… !

Idée fixe  obstiverance ≠ dogmatism

Alan day

Building GOLF  a relation with Gabriel ÔLovely Fellow

Thank you Alan !

Alan day

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