scholarly journals Effects of a Weak Intrinsic Magnetic Field on Atmospheric Escape From Mars

2018 ◽  
Vol 45 (18) ◽  
pp. 9336-9343 ◽  
Author(s):  
Shotaro Sakai ◽  
Kanako Seki ◽  
Naoki Terada ◽  
Hiroyuki Shinagawa ◽  
Takashi Tanaka ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Atmospheric Escape ◽  
Intrinsic Magnetic Field

scholarly journals Why an intrinsic magnetic field does not protect a planet against atmospheric escape

2018 ◽  
Vol 614 ◽  
pp. L3 ◽  
Author(s):  
Herbert Gunell ◽  
Romain Maggiolo ◽  
Hans Nilsson ◽  
Gabriella Stenberg Wieser ◽  
Rikard Slapak ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Escape Rate ◽  
Sufficient Condition ◽  
Atmospheric Escape ◽  
Intrinsic Magnetic Field ◽  
Polar Caps ◽  
Wide Range ◽  
Atmospheric Loss ◽  
Planetary Magnetic Field

The presence or absence of a magnetic field determines the nature of how a planet interacts with the solar wind and what paths are available for atmospheric escape. Magnetospheres form both around magnetised planets, such as Earth, and unmagnetised planets, like Mars and Venus, but it has been suggested that magnetised planets are better protected against atmospheric loss. However, the observed mass escape rates from these three planets are similar (in the approximate (0.5–2) kg s−1 range), putting this latter hypothesis into question. Modelling the effects of a planetary magnetic field on the major atmospheric escape processes, we show that the escape rate can be higher for magnetised planets over a wide range of magnetisations due to escape of ions through the polar caps and cusps. Therefore, contrary to what has previously been believed, magnetisation is not a sufficient condition for protecting a planet from atmospheric loss. Estimates of the atmospheric escape rates from exoplanets must therefore address all escape processes and their dependence on the planet’s magnetisation.

scholarly journals Plastic Deformation Influence on Intrinsic Magnetic Field of Austenitic Biomaterials

2016 ◽  
Vol 67 (6) ◽  
pp. 407-413
Author(s):  
Milan Smetana ◽  
Klára Čápová ◽  
Vladimír Chudáčik ◽  
Peter Palček ◽  
Monika Oravcová
Keyword(s):  
Magnetic Field ◽  
Plastic Deformation ◽  
Austenitic Steel ◽  
Medical Practice ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Intrinsic Magnetic Field ◽  
Fluxgate Sensor ◽  
Non Destructive Evaluation ◽  
Non Destructive

Abstract This article deals with non-destructive evaluation of austenitic stainless steels, which are used as the biomaterials in medical practice. Intrinsic magnetic field is investigated using the fluxgate sensor, after the applied plastic deformation. The three austenitic steel types are studied under the same conditions, while several values of the deformation are applied, respectively. The obtained results are presented and discussed in the paper.

Martian Atmospheric Evolution: Implications of an Ancient Intrinsic Magnetic Field

Astrobiology ◽  
2002 ◽  
pp. 203-217 ◽  
Author(s):  
Helmut Lammer ◽  
Willibald Stumptner ◽  
Gregorio J. Molina-Cuberos
Keyword(s):  
Magnetic Field ◽  
Atmospheric Evolution ◽  
Intrinsic Magnetic Field
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