Lunar Magnetic Fields & Biology

Lunar Crustal Magnetic Field Heterogeneity & Biological Implications

A FAIR-compliant planetary geophysics and space biology investigation evaluating hypomagnetic field (HMF) environments across active, historical, and candidate human landing sites on the Moon. Target journal: npj Microgravity (Nature Publishing Group).

🌐 Explore 3D Interactive Globe 📊 Landing Site Data Explorer 📄 Read Manuscript (PDF)

📌 Executive Summary & Core Story

Unlike Earth, which maintains a continuous global dipole dynamo producing a ~50 µT (~50,000 nT) geomagnetic field, the Moon underwent core dynamo extinction over 3 billion years ago. Today, the lunar surface presents localized, non-dipolar crustal magnetic anomalies interspersed with vast near-null regions.

When biological payloads and human habitats land on the Moon—including all 13 Artemis III South Pole candidate regions—they operate under extreme hypomagnetic field (HMF) conditions (< 1.0 nT), over 30,000× weaker than Earth’s magnetic field. This study combines satellite magnetometer observations (Lunar Prospector & SELENE/Kaguya) with a systematic review of magnetobiology literature to quantify environmental risks for long-duration lunar biological payloads and bioregenerative life support systems.

📊 Manuscript Figures & Scientific Findings

Figure 1: Global Map of Lunar Crustal Magnetic Field Magnitude

Figure 1: Global Map of Lunar Crustal Magnetic Field Magnitude

Figure 1 | Global distribution of lunar crustal magnetic field magnitude (|B|). Total field intensity |B| at 30 km altitude derived from Lunar Prospector and SELENE (Kaguya) magnetometer observations. Global background field is ultra-low (mean |B| = 0.77 nT, median = 0.56 nT), punctuated by intense localized crustal anomalies concentrated in the South Pole-Aitken (SPA) basin and impact basin antipodes.

Key Insights:

Figure 2: Constituent Vector Field Components (Br, Bθ, Bφ)

Figure 2: Vector Components of Lunar Crustal Magnetic Field

Figure 2 | Three-component vector decomposition of the lunar magnetic field at 30 km. Top: Radial component (Br). Middle: Colatitudinal/Southward component (Bθ). Bottom: Azimuthal/Eastward component (Bφ). Units in nanoteslas (nT).

Key Insights:

Figure 3: Candidate & Historical Landing Sites Overlay

Figure 3: Landing Sites Overlaid on Lunar Magnetic Map

Figure 3 | Geographic overlay of 23 key lunar mission sites on the crustal magnetic field map. Yellow stars: 13 Artemis III South Polar candidate regions; Blue circles: Apollo 11–17 landing sites; Green squares: Chang'e 3, 4, & 5 sites; Red triangle: Chandrayaan-3.

Key Insights:

Figure 4: Comparative Field Strengths Across Landing Sites

Figure 4: Comparative Magnetic Field Magnitude Across Landing Sites

Figure 4 | Quantitative comparison of magnetic field magnitude (|B|) at 30 km altitude across landing sites. Color-coded by biological regime: Blue = Low/Null-Field (< 1.0 nT); Orange = Moderate Field (1–5 nT); Red = High Field (> 5.0 nT).

Key Insights:

Figure 5: Biological Evidence Matrix of Hypomagnetic Stress

Figure 5: Evidence Matrix of Hypomagnetic Field Effects on Biological Systems

Figure 5 | Systematic review matrix of biological responses to hypomagnetic field (HMF) conditions (< 1 µT). Evidence strength scores synthesized across peer-reviewed empirical studies spanning plants, microbes, invertebrates, mammals, and human cell cultures.

Key Biological Takeaways:

  1. Plant Morphogenesis & Auxin Transport: Near-null magnetic shielding (< 1 µT) disrupts PIN2 polar auxin transport, delays Arabidopsis flowering transitions (CRY/PHY pathway modulation), perturbs iron homeostasis, and triggers elevated reactive oxygen species (ROS) accumulation.
  2. Cellular Radical Pair Mechanism: Magnetic field absence alters radical pair spin-state recombination kinetics (singlet-triplet yield ratios), impacting cryptochrome signaling and cellular DNA repair efficiency.
  3. Mammalian & Human Health Risks: HMF shielding accelerates osteoblast demineralization (exacerbating microgravity-induced bone loss), alters circadian clock gene transcription (BMAL1/PER2), and alters microcirculatory blood flow.

Supplementary Details: South Polar Detail & Field Distribution

Figure S1: South Pole Detail Map

Figure S1 | Artemis III South Pole Stereographic Map. High-resolution magnetic topography (80°S to 90°S) showing candidate landing sites relative to polar crater rims and permanently shadowed regions (PSRs).

Figure S2: Field Intensity Histogram

Figure S2 | Global Field Intensity Distribution. Log-normal distribution of total magnetic field magnitude |B| across 140,000+ spatial bins at 30 km altitude, demonstrating that >95% of the lunar surface is hypomagnetic.

🛠️ Interactive Tools & Resources