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As per the thread title. That said, I think there is a bit of nuance to this.

Firstly, at a higher organisational level, the answer is a clear no. As a key formation of the Imperial Army, it would have been dissolved when the Imperial Army was divided into the Imperial Guard and Navy. The Solar Auxilia operated combined naval and ground forces, so these would have been split out. The name Solar Auxilia probably also went out of official use.

However, at a regimental or cohort level (depending on how a particular Solar Auxilia formation was organised), there would be no reason to dissolve them and any such force could easily be slotted into the new Imperial Guard once stripped of their void craft. At the onset of the Horus Heresy, approximately 20-25% of all Imperial Army formations were Solar Auxilia raised from across the Imperium. So I think it is very likely that a high proportion of early Imperial Guard regiments would continue to be equipped and trained in a manner consistent with the Solar Auxilia. However, at this point, they would no longer be called Solar Auxilia, but would instead simply bear a regimental name from their homeworld. Given the widespread devastation caused by the Heresy, I suspect that even these early SA-pattern Guard regiments would be experiencing a degredation in equipment quality with locally-manufactured alternatives substituting for the advanced gear no longer being supplied by ravaged forge worlds etc.

Ultimately, I think this is why the Imperial Guard of the 41st millennium no longer uses equipment in a pattern family to the Solar Auxilia on a wide scale- most worlds simply will not be able to produce this high end gear. In addition, the equipment specifically for void combat will no longer be beneficial for many Guard regiments, who have been largely detached from void combat. Solar Auxilia gear adapted to a terrestrial environment is essentially how the Vostroyan Firstborn are equipped- carapace armour with heirloom lasrifles.

That said, the Solar Auxilia originated in the Saturnyne Ordo in the Solar system. Most of their basic equipment was taken straight from the Saturnyne units, who had been using it for centuries. Whilst the worlds of Saturn are gone, replaced by an Inquisitorial stronghold and the Grey Knights, I think it is highly likely that forces raised from the Solar system outside the terrestial worlds will use Solar-pattern void armour and have a specialty in void combat (for example, soldiers recruited from the orbital habitats of Jupiter and Neptune). I also think it is likely that Battlefleet Solar would use Solar-pattern gear for their Naval armsmen.

Other places in the Imperium that supplied Solar Auxilia durimg the Great Crusade and which are orbital habitats or similar may still supply Guard regiments with the same style of void gear too, continuing that tradition as it makes sense for their circumstances.

To summarise: the Solar Auxilia no longer exists as an organisation, but I think it is likely that Imperial Guard regiments equipped in a similar manner and maintaining the aesthetic will be raised from the Solar System itself and a handful of other void-worlds scattered around the Imperium.

Well, in some form of other I’d be surprised if they don’t still exist.

Possibly with the Sol System as a specialised force for boarding enemy ships. And I’d be very surprised if given their demands, Rogue Traders don’t have similarly armed and trained Voidsmen. And the same could easily go for any privately equipped force, including Planetary Governors personal guard.

Charonite Ogryns however are apparently now considered Heretek, so they may be very thin on the ground.

pretty much what Grotsnik said, I also reckon they are still around in some capacity in 40k even if in name only, the Imperium loves its symbolism and the heroic Auxlia forces defending Terra against the arch enemy fill that role very nicely.

What was the Terran system defence forces like in the Time of the Beast? Not read it myself

The Imperial Fists had their permanent garrison on Terra before they all died fighting the Chromes and Orks.

The Lucifer Blacks were one of the Old Hundred, the original Army Regiments, and they were the mortal guards of the Imperial Palace and Senatorum.

There was Battlefleet Solar of course plus local system defences.

In terms of anything other than those specific forces, its a bit of an unknown.
I doubt the Solar Auxilia were anything but a shadow of their former selves after the Heresy.
Guilliman's reforms would have seen them relegated to Guard Regiments from a given planet or drafted to the Navy.

I suspect after the peril of The Beast, the Sol System would’ve been reinforced top to tail.

I think the strategy was less "Fortify Sol" and more "Get more stuff out there so stuff doesn't get near Sol".

More Astartes, more Guard, more Navy, more Forge Worlds.

If everything else is stronger (or a tempting target) then Terra is safe and the fewer eyes on the Throneworld makes politicing easier.

Didn’t GW just release the guy in the horse that is the head honcho of the solar auxilia

mrFickle wrote:
Didn’t GW just release the guy in the horse that is the head honcho of the solar auxilia

Leontus? No, he's Lord Commander Solar - the senior officer for the Segmentum Solar.




Back on-topic: the Loremasters episode on Solar Auxilia suggests that "Solar Auxilia" became a training system / equipment pattern during the Great Crusade, rather than a specific regiment. If this is the case it's possible there are still planets utilizing it.

The organization itself likely no longer exists. However I would not be surprised if many of its units still do. Maintaining millennia long traditions as they serve in the Imperial guard.

And I'm sure the ships that were once theirs also maintain traditions to match.

 Mr Morden wrote:
What was the Terran system defence forces like in the Time of the Beast? Not read it myself

They didn't have a chance to defend, as an attack moon just appeared around Terra. And then they didn't automatically attack it, for different reasons: 1) Mechanicus is like "Wow, teleportation tech that is accurate/ large scale- we need it!" 2) No one wanted to poke the hornet's nest and most appropriate/ disturbing of all: 3) the Terran leadership got political about it.

I once read that Ultramar had a regiment left over. Separate from their Auxilia. I do not remember where I read this though.

Speaking of, does Terra have its own PDF? If it does, those would be equivalent of Solar Auxillia.

 AldarionTelcontar wrote:
Speaking of, does Terra have its own PDF? If it does, those would be equivalent of Solar Auxillia.

I think the PDF for the orbitals on the gas giants would be more likely to have units in the Saturnine pattern. Terra raises a variety of regiments that seem to be more typical terrestial units, like the Lucifer Blacks or Terran Praefects. At least some of these (Lucifer Blacks) were frontline Regiments of Renown in the Great Crusade, fighting in the van alongside but distinct from the Solar Auxilia.

Terra has permanent garrisons of the Custodes, Imperial Guard, Navy, various Astartes honour guard, Imperial Fist, Black Templars, Sisters of Battle and likely military representation from every Imperial institution that has it.

So yes but not in the traditional sense.

They could have been reorganised into the other side of the split, when the SA were forced to divide their army and navy forces. They could have become what we know now as imperial navy breachers, there is an element of shared aesthetic that points in part to this.

Not all naturally, but some may have.