The Schumann Resonance: A Tool for the In Situ And Remote Sensing Exploration of the Deep Atmosphere of Giant Planets Jean-Pierre Lebreton (LPC2E, LESIA)

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Presentation transcript:

The Schumann Resonance: A Tool for the In Situ And Remote Sensing Exploration of the Deep Atmosphere of Giant Planets Jean-Pierre Lebreton (LPC2E, LESIA) orleans.fr F. Simoes (NASA/GSFC), C. Béghin(LPC2E), J.-J. Berthelier (LATMOS), R. Grard (ESA/RSSD), M. Hamelin (LATMOS)

2 The Schumann Resonance A natural phenomena predicted in 1950 par Winfried Otto Schumann Observed about 10 years later Stationnary EM Waves in the Earths Surface-Ionosphere cavity

SR General Characteristics

Leaking out: Detectable from above ionosphere NASA video Clip

Figure 2 from Using Schumann Resonance Measurements for Constraining the Water Abundance on the Giant Planets Implications for the Solar System's Formation Fernando Simões et al ApJ doi: / X/750/1/85

6 Huygens HASI/PWA Experiment Objectives: Measure conductivity of atmosphere and surface (Solid or Liquid); Detect associated EM waves (and sound) associated to putative lightnings RX 1 TX MI 1 TX MI 2 RX 2 Relaxation Probe 1 Relaxation Probe m

7 Mission Time 1930 s => Pre-programmed Mode Change MT ~ 900 s Parachute exchange Narrow Band Signal with High Q Factor ~ 6 Hz Moyenne de 61 spectres Altitude km Seuil de bruit Comparable To Earth SR Signal Beghin et al. 2009; 2011

8 La couche réflectrice dans lionosphère est en accord avec les modèles Une couche inférieure est indispensabe pour une resonance Schumann Loffset observé au sol est consistent avec la faible conductivité de la glace Le facteur de qualité Q = 6 contraint une couche de glace sans perte Offset près de la surface E = 0 ( surface conductrice) Extrapolation of the E profile implies an ocean ~ km under the ice Titan Ocean: Huygens HASI/PWA Result

9 Flux de puissance EM ~ Wm -2 Hz -1 Densité de puissance ~ 10 4 WHz -1 Puissance ELF nécessaire ~ 10 7 W Courants ionospheriques ~ 10 5 A Voltage trans-méridien ~ V Puissance totale disponible ~ W Efficacité de conversion requise ~2% Mécanisme de conversion : Instabilité acoustique-ionique Turbulence ES Conductivité anormale de 0 à 1000 Hz Emission par dipôles magnetiques ELF verticaux Source idéale dharmoniques sphériques en modeTE, E horizontal Une source dexcitation permanente existe plus efficace en ELF que des éclairs dorage

Giant Planet Atmosphere Conductivity Profile Sensitivity to Water Content Simoes et al, 2012

Figure 8 from Using Schumann Resonance Measurements for Constraining the Water Abundance on the Giant Planets Implications for the Solar System's Formation Fernando Simões et al ApJ doi: / X/750/1/85

Saturn: Cassini Opportunities Titan flyby: RPWS ? – Leak out to be studied : No intrinsic B Field – Need to study if specific observation possible/worth Saturn peripase passages: RPWS, MAG ? – Best opportunity may arise during end-of-mission proxima phase – Lots of lightnings; Strong B-field – Leak out mecanism to be studied

Future In situ Missions In situ E vs B ? – E-field more sensitive – Requires E-field sensitive antennae Low-resources instrument concept was studied for TSSM (Montgolfière and Lake lander) by members of the French Huygens PWA team Alternative concept that may be worth studying: Integrated wire(s) within the parachute system Mars: MAEVEN ?