How is the luminosity of the sun determined?

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Answer 1 · 2015-10-23T12:24:16

$L$ $L$ = $3.79$ $3.79$ x $10^{26}$ $10^26$ Watts

The Formula for Flux of an Object received at Earth is:

$F = \frac{L}{4 . π . D^{2}}$ $F = L / (4.pi.D^2)$

Where,

F is the Flux
L is the Luminosity of the Object
D is the Distance to that object

Rearrange the Formula to get the Luminosity

$L = F .4 . π . D^{2}$ $L = F.4.pi.D^2$

Flux Received from the Sun is 1343 $\frac{W}{m^{2}}$ $W/ m^2$
D is the Distance = 1 AU or 150 Million Kms = $150$ $150$ x $10^{6}$ $10^6$

$L = 1343.4 . 3.142 . {(1.5 x 10^{11})}^{2}$ $L = 1343 . 4 . 3.142 . (1.5 x 10^11)^2$
$L$ $L$ = $3.79$ $3.79$ x $10^{26}$ $10^26$ Watts