Timeline for How to calculate the local maximum solar radiation on Mars from day to day throughout a full martian year?
Current License: CC BY-SA 4.0
13 events
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| Sep 26, 2020 at 17:17 | history | edited | Cornelis | CC BY-SA 4.0 |
changed the term into 1.38138027
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| Aug 15, 2020 at 8:44 | comment | added | Cornelis | @uhoh The numerical values are for the moment when Mars is at perihelion. If you use the JPL Horizons website with output quantities 15 and 19 you can find that on June 22, 2022 the distance from Mars to the Sun is 1.3813 AU, and the 717 W/m² is at the object data page. | |
| Aug 15, 2020 at 3:32 | comment | added | uhoh |
+1 I've adjusted the formatting of the MathJax, can you check to make sure it's okay? I'm just curious where the numerical values of 717 W/m^2 and 1.381 AU come from. If we used the solar constant of 1362 W/m^2 and 1 AU it gives the same answer so there's no problem with them of course. Thanks!
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| Aug 15, 2020 at 3:31 | history | edited | uhoh | CC BY-SA 4.0 |
added 49 characters in body
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| Aug 14, 2020 at 14:46 | history | edited | Cornelis | CC BY-SA 4.0 |
added 2 characters in body
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| Aug 14, 2020 at 8:54 | history | edited | Cornelis | CC BY-SA 4.0 |
changed some numbers
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| Aug 14, 2020 at 8:46 | comment | added | Cornelis | Thank you for answering and leading me to that magnificent JPL Horizons website ! So I've adjusted some numbers in your equation. | |
| Aug 13, 2020 at 22:41 | vote | accept | Cornelis | ||
| Aug 12, 2020 at 21:23 | comment | added | Cornelis | Yes, I think its a lot of work, and for me worth to give bounties after you have done step 1 ! | |
| Aug 12, 2020 at 21:23 | comment | added | JohnHoltz | The pdf titled "Accurate analytic representations of solar time and seasons on Mars with applications to the Pathfinder/Surveyor missions" located at agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1029/97GL01950 gives the equation for the distance r (in my equation, rm in the PDF) and subsolar point (declination in the PDF), and only requires 5 equations, and 29 terms. Not bad! Plus the calculation of the date from J2000, so more equations and terms. | |
| Aug 12, 2020 at 21:16 | comment | added | JohnHoltz | @Cornelisinspace. Yes, step 1 is to calculate the position of Mars from the orbital parameters. Do you want to do that? Or use a website to get representative numbers? (Step 1 is an entire question and answer in itself.) Step 2 is to compute the subsolar point, or the "declination" of the Sun as seen from Mars. That is another series of equations. Then step 3 is what I provide. There may be a simple series of equations that approximate both of those, with only 1 or 2 dozen terms in them. I will see what I can find. | |
| Aug 12, 2020 at 17:16 | comment | added | Cornelis | Sorry for the confusion and the deletion of former comments. Your answer is not wrong i think, but I ask for a time dependent equation (radiation intensity from day to day, depending on the distance from the Sun). | |
| Aug 12, 2020 at 16:35 | history | answered | JohnHoltz | CC BY-SA 4.0 |