March 2026 Fireball Cluster — Statistical Significance and Space Weather Context

Author: TerraPulse Lab

Status: Complete

Created: 2026-03-22

Dataset: 868 CNEOS fireballs (1988–2026) + TerraPulse space weather data

Context: The Sentinel Network special report

Abstract

We assess the statistical significance of the March 2026 fireball cluster reported by The Sentinel Network (11 events in 20 days across 4 continents, including 3 meteorite falls). Against the NASA/JPL CNEOS fireball baseline (868 events over 37.9 years, rate = 22.9/year), the CNEOS-registered count for March 2026 (2 events) is not anomalous (). However, the article's broader count of 11 events from multiple detection networks yields — extremely statistically significant against the CNEOS Poisson baseline. This discrepancy reveals a critical detection completeness gap: CNEOS captures only a fraction of actual fireball events. Additionally, CNEOS fireballs are themselves temporally clustered (), meaning even the baseline is not truly Poisson. The March 17 Cleveland event (12.6 kt, 68th percentile) and concurrent geomagnetic storm ( on March 13) occurred during an active space weather period captured in TerraPulse data.

Key Findings

CNEOS Baseline Statistics

Is the Cluster Significant?

The stark difference reveals the detection completeness problem: CNEOS captures ~23 events/year globally, while the actual bolide rate (combining AMS reports, ground-based cameras, and eyewitness networks) is substantially higher. The article's count of 11 may itself be incomplete.

CNEOS Fireballs Are Temporally Clustered

The CNEOS fireball catalog is itself temporally clustered — consistent with our Cross-Domain Clustering Atlas finding that environmental events universally cluster. This means Poisson-based significance tests (like the one above) are conservative: the true significance of the March 2026 cluster may be even higher when accounting for baseline clustering.

March 2026 Events in Detail

The Cleveland event at 12.6 kilotons is notable but not exceptional — it's at the 68th percentile of all CNEOS events. The physical significance lies not in individual event energy but in the cluster frequency.

Space Weather Context

TerraPulse space weather data during the cluster period:

The March 13 geomagnetic storm () coincides with the 57 AMS fireball reports. However, fireballs are meteoroid impacts, not magnetically influenced particles — any correlation with Kp would be coincidental unless the geomagnetic disturbance affected detection sensitivity (e.g., increased atmospheric ionization enhancing radar detection).

Interpretation

1. The CNEOS database is incomplete — it captures only the largest bolides detected by US government sensors. The actual fireball rate is far higher.

1. 11 events in 20 days is statistically extraordinary against the CNEOS baseline (), but this comparison may be invalid if the detection networks (AMS, European cameras, eyewitness reports) have different completeness than CNEOS.

1. A fair test requires comparing like with like — AMS historical daily report rates would be the proper baseline for the Sentinel Network's count. CNEOS is the wrong denominator.

1. Fireballs cluster independently of solar activity — meteoroid orbits are governed by gravitational dynamics, not electromagnetic fields. The space weather coincidence is likely just that.

1. The CV = 2.77 finding adds fireballs to our cross-domain clustering atlas as another universally clustered environmental event stream.

Related Papers

• Our Paper: Temporal Clustering is Universal (PDF) — companion paper establishing temporal clustering () in the CNEOS fireball catalog
• Our Paper: The March 2026 Fireball Cluster (PDF) — this workspace's arXiv paper draft
• Busko (2026): Fast Transients in Archival Plates (arXiv:2603.20407) — independent validation of sub-second optical transients in 1950s Hamburg Observatory plates

Visualizations

• Interactive Dashboard
• Static Figure