A Tower Controller reported GPS outage.

Narrative

ADSB/GPS Outage in the Denver Metro area. At around XA:00Z D01 notified ZZZ1 that there are GPS (to include ADSB) anomalies within 50 miles of Denver. We immediately started broadcasting this on the ATIS. As traffic has picked up today (still relatively slow for ZZZ1); we've had numerous reports of aircraft losing ADSB; and numerous reports of aircraft losing GPS. We also lost all ADSB on our side for approximately an hour. This is problematic for our operation. Since the implementation of ADSB; we have had many controllers train and certify using this feature. I am currently the only controller on shift that certified prior to ADSB. If our traffic was moderate it would be a safety concern; especially during a VFR pop up arrival rush. As for the GPS outages; most of the aircraft reported losing their GPS on finals from as far out as 15 miles to within 1 mile final. Luckily today is VFR. However; this time of year through April are our heaviest precipitation months. Often strong frontal patterns move in quickly; with last minute changes in forecast. We provide service for pilots with little experience; and though today is VFR; many general aviation aircraft have returned to base due to GPS outages. We have logged aircraft reporting issues in our facility log. We currently have 11 reports. There are many that have inquired about outages; but did not report an outage themselves. We are not seeing all aircraft ADSB on our side. When we lose their ADSB in the pattern; we are full stopping them to keep the operation safe. We also have the concern for the aircraft that are losing their ADSB while flying under the Bravo airspace. I am simply passing along safety information. I have heard of a 'solar storm' and I am aware of the 5G implementation. I will not speculate on the cause of the outages today. I am hopeful you can find out what happened and fix it.