<title>Astroclimate inside the dome of AZT-14 telescope of Sayan Solar Observatory</title>

Abstract

This work presents the results of measurements of intradome astroclimate parameters of the AZT-14 telescope of Sayan solar observatory of the ISTP SB. The picture of airflows concerned with the warm air run-out though leaky connections and air mixing inside the telescope after dome opening is obtained. It is shown that the value of the structure characteristic of the refractive index C n 2 in closed and open dome can 1.5-2 times differ. Essential turbulence intensification in front of the entrance telescope mirror when dome opening is ascertained. Strongly unstable stratification near the receiver is observable, caused by the stair opening in the concrete floor of the dome, which can result in intensification of the refractive index fluctuations in the presence of even small heat sources. Conclusions are drawn from the measurements, which can be related to all telescope of the considered class. It is necessary to prevent foreign heat sources in the dome and block warmer airflows from the stair opening; astronomical observations are to be carried out after completion of transient processes related to the dome opening.

Structure of air motion along optical paths inside specialized rooms of astronomical telescopes. Numerical simulation

“…Ðåçóëüòàòû íàòóðíûõ ýêñïåðèìåíòîâ ïîêàçûâàþò, ÷òî âíóòðè çàêðûòûõ ïîìåùåíèé íàáëþäàþòñÿ óåäèíåííûå êðóïíûå âèõðè (êîãåðåíòíûå ñòðóêòóðû èëè òîïîëîãè÷åñêèå ñîëèòîíû) [1][2][3][4]. Ãèäðîäèíàìè-÷åñêàÿ êîãåðåíòíàÿ ñòðóêòóðà -êîìïàêòíîå îáðàçîâàíèå, âêëþ÷àþùåå â ñåáÿ äîëãîaeèâóùóþ ïðîñòðàíñòâåííóþ âèõðåâóþ ñòðóêòóðó (ÿ÷åéêó), âîçíèêàþùóþ â ðåçóëüòàòå ïðîäîëaeèòåëüíîãî äåéñòâèÿ òåðìîäèíà-ìè÷åñêèõ ãðàäèåíòîâ, è ïðîäóêòû åå äèñêðåòíîãî êîãåðåíòíîãî êàñêàäíîãî ðàñïàäà.…”

“…ñîáîé ðåçóëüòàò òðàíñôîðìàöèè ýíåðãåòè÷åñêèõ âîçìóùåíèé íà ãðàíèöàõ îáúåìà â äâèaeåíèå aeèäêîé ñðåäû.  ðàñøèðåííîì îïðåäåëåíèè îäíà òàêàÿ (îáû÷íî äîëãîaeèâóùàÿ) ÿ÷åéêà âìåñòå ñ ïðîäóêòàìè äèñêðåòíîãî êîãåðåíòíîãî êàñêàäíîãî ðàñïàäà ñàìîé ýòîé ÿ÷åéêè íàçûâàåòñÿ êîãåðåíòíîé ñòðóêòóðîé [1][2][3][4][5][6][7][8][9]11].…”

“…Êîãåðåíòíàÿ ñòðóêòóðà ñîäåðaeèò êàê êðóïíî-, òàê è ìåëêîìàñøòàáíóþ òóðáóëåíòíîñòü. Ïðè ýòîì îäíîìåðíûé ñïåêòð òóðáóëåíòíîñòè (êîìïîíåíò ñêîðîñòè è òåìïåðàòóðû) èìååò áîëåå áûñòðîå óáûâàíèå â èíåðöèîííîì èíòåðâàëå (îáû÷íî 8/3-ñòåïåííîå óáûâàíèå, êîòîðîå â âûñîêî÷àñòîòíîé ÷àñòè èíåðöèîííîãî èíòåðâàëà ïåðåõîäèò â åùå áîëåå ñèëüíîå 12/3-ñòåïåííîå óáûâàíèå) ïî ñðàâíåíèþ ñ êîëìîãîðîâñêèì 5/3-ñòåïåííûì óáûâàíèåì [1][2][3][4][5][6][7].…”

“…Ïåðåõîä îò ñîñòîÿíèÿ õàîñà (íåñòàöèîíàðíûå äâèaeåíèÿ, áûñòðî ðàñïàäàþùèåñÿ âèõðè) ê ñòàöèîíàðíûì äâèaeåíèÿì (î÷åíü ìåäëåííî ðàñïàäàþùèåñÿ âèõðè) ïðîèñõîäèò â âîçäóõå îáû÷íî çà ïåðèîä îò 1 ìèí äî äåñÿòêîâ ìèíóò. 4.  ñëó÷àå íåîäíîðîäíî íàãðåâàåìûõ ïðîòÿaeåííûõ ïîâåðõíîñòåé ñïåöèàëèçèðîâàííûõ ïîìåùåíèé (íà ãðàíèöàõ îáúåìà) â ñïåêòðå òóðáóëåíòíîñòè ïðèñóòñòâóþò íåáîëüøèå ó÷àñòêè, õàðàêòåðèçóåìûå êîëìîãîðîâñêîé 5/3-ñòåïåííîé çàâèñèìîñòüþ.…”