Description: Long scientific letter from American astronomer TM Donahue Long scientific letter from American astronomer TM Donahue Document type : Typed letter with numerous autograph graphics Number of documents: 1 - Number of pages: 7 p. - Size: In-4 Place : Without Date : August 18, 1955 RECIPIENT : Without State : Minimal creases. Typed letter signed by Thomas Michael Donahue with autograph diagrams, addressed to a French colleague. In English. Autograph additions and apostille. Long and beautiful letter illustrated with 9 diagrams, 3 scientific formulas and a sheet of autograph graphics by Donahue. “[…] Your letter fascinated me. I was very pleased to learn of your results. I, too, am inclined to believe that the maximum you find in an effect of resonance absorption. I have been working during the summer along with a very helpful graduate student to develop complete theory for the twilight (and daytime) radiation from sodium layer with takes into account absorption and radiation of the resonance photons from the sun with subsequent imprisonment of the resonance radiation. The first step in this calculation is to obtain the density of sodium atoms excited directly by sunlight as a function of altitude and solar depression from noon to the end of twilight […]”. Long and fascinating presentation illustrated with graphs, diagrams and formulas. The letter is accompanied by a sheet of graph paper with curves and calculations by Donahue. Blue ink on printed letterheads and large circular watermark featuring a glowing lit candle "1787 University of Pittsburgh". Thomas Michael Donahue (Healdton, Oklahoma, 1921/2004)American physicist and astronomer. Fixed costs: same costs for all buyers Services Shipping time: 1 business day Insurance: included in shipping costs Excluded locations: No locations are excluded Payment Payment methods accepted: Bank check Contact us for any questions. Typed letter signed by Thomas Michael Donahue with autograph diagrams, addressed to a French colleague. In English. Autograph additions and apostille. “[…] Your letter fascinated me. I was very pleased to learn of your results. I, too, am inclined to believe that the maximum you find in an effect of resonance absorption. I have been working during the summer along with a very helpful graduate student to develop complete theory for the twilight (and daytime) radiation from sodium layer with takes into account absorption and radiation of the resonance photons from the sun with subsequent imprisonment of the resonance radiation. The first step in this calculation is to obtain the density of sodium atoms excited directly by sunlight as a function of altitude and solar depression from noon to t
Price: 859.68 USD
Location: Paris
End Time: 2024-12-05T19:33:48.000Z
Shipping Cost: 21.74 USD
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