I am hotter than the sun and keep out of sight.
I guide you on your way when you travel at night.
I measure the ozone at a great height.
Yet I was lost in the ice.
What am I?
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Polaris
I am hotter than the sun and keep out of sight
the north star's temperature is higher than the sun's and we can't see it at daylight or in the southern hemisphere.
I guide you on your way when you travel at night.
Polaris, the north star, which is very close to the north celestial pole and so guides travellers to the north at night.
I measure the ozone at a great height
The Photochemistry of Ozone Loss in the Arctic Region In Summer (POLARIS) is the latest in a series of high-altitude airborne investigations of atmospheric ozone.
Yet I was lost in the ice (credit to @Morgan G)
refers to the Polaris expedition (1871)
The answer is
Helium
I am hotter than the sun and keep out of sight.
There are stars that are hotter than the sun, they are made of burning helium. Helium is also usually invisible to the human eye.
I guide you on your way when you travel at night.
Stars are used for navigation at night
I measure the ozone at a great height.
Scientists use helium-filled weather balloons to measure ozone levels in the atmosphere.
Yet I was lost in the ice.
Helium is soluble in ice, which makes measuring helium levels using ice cores difficult.
You are
the earth’s core.
I am hotter than the sun and keep out of sight.
The Earth’s core is hotter than the surface of the sun. It can’t be seen by us surface dwellers.
I guide you on your way when you travel at night.
The earth’s core consists mainly of molten iron which generates a magnetic field as the earth spins. This magnetic field causes other magnets such as the needle of a compass to align with it and point to the magnetic north pole, allowing travellers to navigate when they have no other way of telling which direction is north.
I measure the ozone at a great height.
The magnetic field extends far further than the surface of the earth and influences the amount of ozone in the upper atmosphere.
Yet I was lost in the ice.
During the ice ages, much of the earth’s surface was covered in ice.
It could be
Solar Radiation (Or one of the other names for it)
I am hotter than the sun and keep out of sight.
The sun's rays are 5778 Kelvin and the Sun is 5777 Kelvin according to Google. You can't see the sun's rays either because they are Ultra-Violet (UV)
I guide you on your way when you travel at night.
The rays reflect off the moon which is why it looks like it glows. The moonlight could light our way at night
I measure the ozone at a great height.
The ozone layer keeps most UV Rays out
Yet I was lost in the ice
Ice absorbs these rays