Astronaut photographs and orbiting sensors are capturing atmospheric events that unfold far above where most people ever look, and the evidence is forcing scientists to rethink how often these phenomena actually occur. From electrical discharges that shoot upward from thunderstorms into the edge of space to ice clouds glowing at about 50 miles altitude, satellite missions and crew aboard the International Space Station have recorded events that ground-based observers almost never witness. The records are real, localized, and increasingly well-documented, but major questions remain about whether some of these events are growing more frequent or simply more visible.
Satellites and astronauts are rewriting what counts as rare
For decades, accounts of glowing high-altitude clouds and lightning inside volcanic ash plumes were treated as curiosities, reported by pilots or polar researchers with little systematic data to back them up. That changed when dedicated satellite instruments began scanning the upper atmosphere on regular schedules. The AIM mission became the first satellite designed to study noctilucent clouds, the wispy ice formations that form at about 50 miles altitude and glow after sunset when sunlight still reaches their extreme height. AIM now documents the seasonal life cycle of these clouds and provides hemisphere-wide views that no ground observer could replicate.
A separate instrument, CALIPSO, recorded polar stratospheric clouds on January 4 near Greenland, with analysis attributing their formation to mountain waves generated by terrain. These iridescent clouds sit in the stratosphere and play a direct role in ozone chemistry, yet they are visible from the surface only under narrow lighting conditions at high latitudes. Without CALIPSO’s lidar profile from that single pass, the event would have gone unrecorded in any formal dataset.
The hypothesis that noctilucent and polar stratospheric clouds have increased measurably at lower latitudes since 2007, independent of volcanic forcing, draws on the logic that AIM and CALIPSO now provide continuous monitoring where none existed before. AIM’s hemisphere-wide coverage has revealed seasonal patterns and geographic extent that earlier ground reports could not capture. But the available mission summaries describe seasonal timing and spatial coverage without publishing peer-reviewed occurrence frequency tables for mid-latitude sightings. That gap means the hypothesis remains plausible but unconfirmed by the public record.
In parallel, the broader fleet of Earth-observing spacecraft has expanded the catalog of unusual upper-atmospheric events. Instruments originally built for weather forecasting or climate research now double as discovery tools for rare-looking phenomena. Routine scans from polar-orbiting satellites, documented through the main NASA portal, have turned one-off anecdotes into repeatable observations that can be compared across seasons and regions. What once might have been dismissed as an isolated oddity now appears as a recurring feature of the coupled atmosphere–space environment.
Gigantic jets, volcanic lightning, and the instruments that caught them
High above thunderstorms, a category of electrical discharge called Transient Luminous Events includes both sprites and gigantic jets. These events fire upward from storm tops into the mesosphere and ionosphere, regions between roughly 30 and 60 miles above the surface. NASA astronaut Nichole Ayers photographed one such event from the ISS, and the image was initially identified as a sprite before researchers corrected the classification: it was a gigantic jet, a distinct and rarer phenomenon. No ground-based visual confirmation log exists for that specific event. The only record is the astronaut photograph itself, which highlights how dependent detection remains on orbital vantage points and alert crew members.
Gigantic jets are part of a broader spectrum of storm-related emissions that bridge the gap between weather and space physics. They connect thundercloud charge regions to the ionosphere, injecting electrical energy and altering local plasma conditions. Yet because they erupt above storm tops and last only milliseconds, they are almost invisible to people on the ground. Even dedicated ground cameras must be in the right place, at the right time, with clear skies and unobstructed horizons. The ISS, circling Earth every 90 minutes, offers a dramatically better chance of catching such an event in progress.
Volcanic lightning presents a different detection challenge. During the 2016 to 2017 eruption of Bogoslof volcano in Alaska, researchers documented lightning generated inside the ash plume. Peer-reviewed research hosted by the USGS examined whether ice-charging processes within the eruption column could explain the discharges. A separate peer-reviewed study in the NOAA institutional repository confirmed that the volcanic lightning at Bogoslof produced measurable thunder and electromagnetic pulses, detected through global lightning networks and acoustic sensors rather than direct observation. No researcher was inside the plume sampling charge mechanisms during the eruption. The evidence instead comes from remote detection networks that picked up acoustic and electromagnetic signatures at a distance.
These cases share a common thread. Each phenomenon is real and physically explained, but each was captured by instruments or observers operating far from the event itself. Ground-level witnesses are almost never present. The Bogoslof eruption occurred on a remote, uninhabited island. Gigantic jets fire above oceanic thunderstorms at night. Noctilucent clouds are visible only during a narrow twilight window at high latitudes. Polar stratospheric clouds require specific sun angles and extreme cold. The rarity for human eyes is not about the events being uncommon in nature but about the mismatch between where they happen and where people live.
Open questions about frequency, latitude, and detection bias
The strongest unresolved question is whether these phenomena are actually becoming more common or whether better instruments are simply catching events that always occurred. AIM provides seasonal timing data and spatial coverage for noctilucent clouds, but the mission summaries available do not include peer-reviewed frequency tables that would allow a clean trend comparison across years or latitudes. Without that data in the public record, claims about noctilucent clouds spreading toward the equator rest on anecdotal reports and informal analyses rather than formal statistical evidence.
CALIPSO’s polar stratospheric cloud observations face a similar interpretive problem. A single overpass can reveal a striking cloud layer above a mountain range, but the satellite’s narrow ground track and the requirement for precise lighting conditions limit how often such clouds are actually seen. An apparent increase in detections could reflect more attentive analysis or improved algorithms rather than any underlying physical change in the atmosphere. Until long-term, homogenized datasets are assembled and released, researchers must be cautious about labeling these events as either “emerging” or “intensifying.”
Gigantic jets and sprites raise additional questions about latitude and storm type. Most documented events cluster over tropical and subtropical oceans, where deep convection is common and where few people watch the sky at night. Expanding networks of space-based optical sensors and ground-based radio arrays are now catching more of these discharges, but the coverage remains uneven. A shift in the apparent geographic distribution might therefore say more about where instruments are pointed than about where the atmosphere is actually most active.
Volcanic lightning data are even more skewed. Only a small fraction of eruptions occur close to dense sensor networks, and only some plumes grow tall and ash-rich enough to generate strong electrical activity. As with upper-atmospheric discharges, the record is dominated by events that happened to intersect existing detection systems. That makes it difficult to answer basic questions about how eruption style, plume height, or atmospheric temperature influence the likelihood of lightning.
From curiosity to climate and space-weather relevance
Despite the uncertainties, the growing catalog of high-altitude phenomena is reshaping how scientists think about the atmosphere as a coupled system. Noctilucent and polar stratospheric clouds serve as tracers of temperature, humidity, and wave activity at altitudes that are otherwise hard to measure. Transient Luminous Events, including gigantic jets, reveal how thunderstorms inject energy into the upper atmosphere and potentially influence radio wave propagation. Volcanic lightning offers a rapid diagnostic of ash plume dynamics that can feed into aviation hazard forecasts.
The shift from anecdote to dataset has been driven in part by systematic communication of mission results through NASA news updates, which highlight both spectacular images and the underlying science. As more instruments come online and more years of data accumulate, the line between “rare” and “rarely seen” is likely to move again. Some phenomena may turn out to be routine features of the atmosphere–space boundary, while others remain genuinely exceptional.
For now, the evidence supports a cautious conclusion. High-altitude clouds, gigantic jets, and volcanic lightning are not figments of imagination or camera artifacts; they are real, repeatable, and increasingly understood in physical terms. What remains uncertain is how their true frequency compares with the fragmentary record built up over the last few decades. Bridging that gap will require not just more sensors but also carefully curated, publicly accessible datasets that allow researchers to separate genuine atmospheric change from the simple fact that, at last, we are looking.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
