How do sun grazing comets survive when so close to the Sun, which is considered hot?
More and more sun grazer comets are being observed and surviving what should be a hot, fiery and melting death.
"Unofficial orbit solution puts this comet at ~4 solar radii on Feb. 19th (2015). That's insanely close," according to the Naval Research Lab's Karl Battam. Comets of this size seldom survive such a close encounter.
Weird, Tiny Comet Survives Solar 'Death Dive', Brightens
Comet Lovejoy reached perihelion on 16 December 2011 at 00:17 UTC, as it passed approximately 140,000 kilometres (87,000 mi) above the Sun's surface at a speed of 536 km/s (333 mi/s), or 0.18% the speed of light. It was not expected to survive the encounter due to extreme conditions in the corona, such as temperatures reaching more than one million kelvins and the exposure time of nearly an hour. However, the Solar Dynamics Observatory (SDO), as well as other Sun-monitoring spacecraft, observed the comet emerge from the corona intact.
Comet Lovejoy - perihelion
Sun grazer comets trigger solar CME's?
Often it seems when these ice dirty balls go through the suns plasma they trigger a CME (Coronal Mass Ejection) of more plasma to explode from the suns surface?
How can a dirty snowball comet do this? The sun is considered quite large compared to a comet. Sun grazing comet Lovejoy is one example.
Is it an electromagnetic trigger and reaction?
Why do sun grazing comets get brighter after perihelion
Why do some sun grazing comets that survive their closest approach point to the sun get brighter?
Is this an electrical reaction?
ISON gave one tantalizing hint that it may still be intact, brightening considerably a few hours after the perihelion passage.
RIP Comet ISON: Scientists Declare Famous 'Sungrazer' Dead After Sun Encounter