Auroras are not caused by light reflecting from snow, but result from charged ions in the solar wind interacting with the upper atmosphere. Light from auroral displays may indeed be reflected by snow, but that reflection has nothing to do with the cause.
An albedo effect is when light is reflected off of surfaces on Earth compared to the amount that gets absorbed. Snow has a high albedo effect which is why so many people get sunburned when they are in a snowy environment and the sun is out. The light gets reflected back to the atmosphere.
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