Sun grazer comets – icy dirt balls or rocky?

sun grazing comet mystery puzzle grazer surive rock not iceComets were dirty snowballs and are now icy dirt balls but do sun grazer comets - comets that go very close to the sun - show that comets are rocky and have little or no ice?

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.

sun grazer grazing comets lovejoy cme plasma

Is it an electromagnetic trigger and reaction?

Comets are just active asteroids, undergoing electrical stress and have an electric potential difference to the suns plasma.

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