Ganymede has strong evidence of a subsurface ocean primarily composed of MgSO₄. We conducted experimental measurements of the electrical conductivity of aqueous MgSO₄ at 200–1,200 MPa and 243–295 K in a multianvil press, simulating the high‐pressure and low‐temperature (HPLT) conditions of Ganymede's subsurface ocean. A numerical model is proposed with logσ = − 3.1605+940.931/T+0.8986logc+2logΛ⁰ − log(5Λ⁰+2695c^1/2), where σ is electrical conductivity in S/m, T is temperature in K, c is molar concentration in mol/L, and Λ⁰ is limiting equivalent conductance in S·cm²·equiv⁻¹. We used this model to generate electrical conductivity curves up to 500 km deep in Ganymede and found that the values are lower than previously predicted. Our novel experimental methods demonstrate access to the HPLT environment of liquid samples that expands our ability for experimental simulation of icy ocean worlds in the outer solar system.

中文翻译：

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硫酸镁水溶液在高压和低温下的电导率及其在木卫三的地下海洋中的应用

木卫三有强有力的证据表明主要由MgSO ₄组成的地下海洋。我们在多砧压机中对200–1,200 MPa和243–295 K时MgSO ₄水溶液的电导率进行了实验测量，模拟了Ganymede地下海洋的高压和低温（HPLT）条件。的数值模型，提出与日志σ  = - 3.1605 + 940.931 / Ť + 0.8986log Ç +2logΛ ⁰  -日志（5Λ ⁰ 2695 Ç ^1/2），其中，σ是在S /米的导电性，Ť是以K温度，ç是mol / L的摩尔浓度，并且Λ ⁰被限制在S当量电导·厘米² ·当量^-1。我们使用该模型生成了木卫三最深500 km的电导率曲线，发现该值低于以前的预测。我们新颖的实验方法证明了进入液体样品的HPLT环境的能力，从而扩展了我们在外部太阳系中对冰冷海洋世界进行实验模拟的能力。