Hi guys and girls,
I've been too busy working that's why I didn't reply yet.
Okay, I noticed many things looking at the sky on a clear day:
(1) Standing up, sun angle making my shadow about 8m/30 ft long, when extend my hand and angle it for the sharpest,
smallest shadow-image of my hand I was looking at my finger shadows.
I actually needed to spread my fingers 2cm (0.8 inch) appart just to see each finger clearly.
In Western Australia, I remember that shadow-unsharpness was almost non-existent.
I spent a year there, long enough to wonder if noticeable shadow-unsharpness even existed on Earth,
or was I just imagining what I thought I saw in Toronto.
By contrast, in Mandurah at the beach,
I played with my shadow at a similar sun angle and if I had to guess the level of shadow-unsharpness,
I would only have to spread my fingers maybe 0.8 cm or 1/8 inch?
(2) The sun on a clear day has a massive halo around it, the size I have never seen in Australia.
If you measure it like a frame around the outline of the sun, then the halo is nearly double the width of the halo I saw in Townsville,
definitely more than double the size I saw in Western Australia
Why this bothers me:
- Most of the time when I've been in Australia, if the temperature was too chilly,
I could almost always feel warm by stepping out into the sun, a
s long as the sun was say 15 degrees or higher. (ie. 1+ hours before sunset or after sunrise)
- I'd use the strength of the sun's infrared to warm me when I was swimming in just a bathing suit.
In Western Australia I can actually feel warm at 21 C/ 70 F and clear skies, even with a 20km/h (14mph) wind, even with a damp bathing suit
-My experience is that climates with sun that has large halos and climates with sun that has small halos (like Florida)
this is not a condition that changes with weather patterns, but seems to be a permanent feature of the geography
- In my opinion, the sky could be completely clear for a full day and it still might never be "sunny enough" for me in Newcastle, NSW.
-It annoys me when the sun strength is mild, if I'm only outside for short periods.
I suppose if I know I'm going to be outside for more than 2 hours, then yes, the mild sun of Newcastle is probably a good thing...
but I don't often spend more than 2 hours out in the sun continuously.
- Infrared radiation is very sensitive and is more readily filtered than UV.
So if there is only 1/2 the infrared output in Newcastle vs. Perth, the UV filtering is probably still less than 1/5th or less than 20% reduction in UV.
It's a lose-lose; not much "sun protection" at the expense of a massive drop in infrared.
- Coal dust? This area is a famous coal producer.
Carbon dust I read somewhere is an excellent reflector of sun infrared and when it's spread around the atmosphere
(volcanic eruption?) then there's a noticeable cooling effect.
- Humidity? Ground level humidity
seems to be irrelevant to sun halo and makes little difference in sun infrared.
Winters in southwestern Australia are extremely humid in terms of relative humidity. My cars windows always had dew on them.
But the winter sun at 8am was powerful enough, you almost feel like you could get a tan.
Maybe there's something going on with the humidity at higher altitudes here though.
If I can find out the source of Newcastle's massive sun halos and piddly sun infrared output...
then it will help me find the closest place where I can find strong sunshine to go on holidays.