French scientists announced the detection of mini lightning sounds on the ground of Marte, picked up by the microphone of NASA’s Perseverance robot. Electrical discharges were recorded 55 times over two Martian years, mainly during storms and dust devils. The discovery, published on Wednesday (26), represents the first acoustic proof of electrical activity on the Martian surface.
The Perseverance rover, which has been exploring Marte since February 2021, has a microphone installed on the main mast, used for rock analysis. Electric sparks were heard less than 2 meters from the equipment, amid gusts of wind and impacts of dust particles.
Researchers analyzed 28 hours of recordings to identify the characteristic signs of the discharges. Most events occurred during the windiest Martian days, when dust activity is most intense.
Analysis of recordings reveals specific pattern
The team led by Baptiste Chide, of Instituto of Pesquisa in Astrofísica and Planetologia of Toulouse, identified two main types of electrical discharges. The mini lightning strikes generated by dust devils only last a few seconds.
Dust storms, on the other hand, produce longer discharges. Esses events can last for up to 30 consecutive minutes in the Martian atmosphere.
The sounds captured have characteristic crackles. Eles are clearly distinguished from natural interferences such as winds and collisions of grains of sand.
Characteristics of the Martian atmosphere favor the phenomenon
The composition of Marte’s atmosphere creates ideal conditions for generating static electricity. Low atmospheric density intensifies contact between charged particles.
Main factors contributing to mini lightning strikes:
- Friction between dust grains: Movimentos fast generate opposite electrical charges
- Low atmospheric humidity: Menos natural conduction of electricity
- High dust density: Maior probability of energetic collisions
- Local electric fields: Acúmulo of loads in specific regions
The Martian atmosphere contains only 0.6% of the density of Earth’s atmosphere. Essa characteristic amplifies the effects of discharges compared to similar phenomena in Terra.
Precise location of electrical discharges
The mini lightning strikes were detected near the Jezero crater. Perseverance has been operating in the region since its arrival, analyzing an ancient dry river delta.
The SuperCam microphone, responsible for recordings, is positioned 2.1 meters above the ground. Sua sensitivity allows you to capture low-intensity sounds in a Martian environment.
Temporal distribution of recorded events:
- Martian Year 1: 27 documented occurrences
- Martian Year 2: 28 occurrences identified
- Concentration: 89% during periods of high dust activity
- Average duration: 4 to 6 seconds per individual flush
The proximity of the discharges to the rover was confirmed by analyzing simultaneous electrical signals. The researchers ruled out interference from the vehicle itself.
Comparison with terrestrial phenomena
Martian discharges have similarities with intra-cloud lightning observed on Terra. However, its scale is significantly smaller due to local atmospheric conditions.
Daniel Mitchard, researcher at Universidade of Cardiff, highlighted the importance of acoustic detection. Ele emphasized that visual phenomena still need to be confirmed by cameras.
Main differences between Martian and terrestrial lightning:
- Intensity: Milhares times less energetic
- Visibility: Quase imperceptible to the naked eye
- Duration: Segundos instead of minutes
- Origin:Poeira instead of water vapor
The absence of dense clouds in Marte limits the formation of traditional lightning. Mini lightning depends exclusively on the interaction between solid particles.
Implications for future space missions
Electrical discharges represent a potential risk for equipment in Marte. Superfícies of solar panels can accumulate harmful static charges.
The data collected by Perseverance provides a baseline for protecting future databases. Materiais conductors and grounding systems will be essential.
The discovery also expands understanding of Martian atmospheric dynamics. Ela complements studies on dust cycles that influence the local climate.
Other sounds already captured in Marte
Perseverance has already recorded several noises characteristic of the red planet. Entre they are the sounds of wheels on rocks and the Martian wind.
The Ingenuity helicopter, which operated until January 2024, produced audible hums. Suas propellers rotated at a specific frequency for the rarefied atmosphere.
Perseverance Historical Recordings:
- First sound: Martian Vento (February 2021)
- Drilling noise: Coleta of rock samples
- Ingenuity Propellers: 72 documented flights
- Dust collisions: Impactos at high speed
These records form a unique sound archive of the Martian surface. Eles allow comparative analyzes between different environmental conditions.
Scientific methodology employed
The French researchers employed advanced audio processing techniques. Algoritmos identified spectral patterns characteristic of electrical discharges.
Validation included cross-analysis with electrical sensor data. Apenas events with simultaneous acoustic and electrical signature were considered valid.
The study covered the entire period of operation of the SuperCam microphone. Temporal consistency reinforces the reliability of observations.
Microphone technical parameters:
- Sampling frequency: 300kHz
- Sensitivity: Capta sounds up to 10 meters away
- Dynamic range: 120 dB
- Temporal resolution: 3 microseconds
The precision of the equipment made it possible to distinguish discharges from common environmental noises. Esse methodological rigor increases the credibility of the discovery.