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Advancement of Space Plasma Measurem...

Samaniego, Joseph Isaac,

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Advancement of Space Plasma Measurements with Novel Langmuir Probe Technologies /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Advancement of Space Plasma Measurements with Novel Langmuir Probe Technologies // Joseph Isaac Samaniego.
作者:	Samaniego, Joseph Isaac,
面頁冊數:	1 electronic resource (147 pages)
附註:	Source: Dissertations Abstracts International, Volume: 82-07, Section: B.
Contained By:	Dissertations Abstracts International82-07B.
標題:	Physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28092972
ISBN:	9798557021289

Advancement of Space Plasma Measurements with Novel Langmuir Probe Technologies /
Samaniego, Joseph Isaac,

Advancement of Space Plasma Measurements with Novel Langmuir Probe Technologies /Joseph Isaac Samaniego. - 1 electronic resource (147 pages)

Source: Dissertations Abstracts International, Volume: 82-07, Section: B.

Langmuir probes have been flown on spacecraft missions for in-situ measurements of the local plasma environment from sounding rocket missions to flagship missions like Cassini or Rosetta over the past 50 years. Langmuir probes are conductors of simple geometries (spheres, disks, cylinders, etc.) inserted into a plasma. By sweeping a voltage on the probe and measuring the current collected or emitted, a current-voltage (I-V) relationship can be found and interpreted to derive the density, temperature, and potential of the ambient plasma. However, even after decades of use, there are still challenges in the analysis and interpretation of Langmuir probe measurements due to non-ideal plasma environments encountered by or created by the spacecraft.In the upper atmospheres of planets atomic oxygen is present in high densities capable of degrading the probe surface, warping the I-V curve of a Langmuir probe or otherwise causing a the probe to incorrectly measure the plasma. Due to plasma interactions with the probe itself and spacecraft there is often an anisotropic or inhomogeneous plasma environments. The following dissertation summarizes the research to find probe coatings whose measurements are least affected by atomic oxygen as well as the construction of a double hemisphere Langmuir probe (DHP) to improve space plasma measurements in: i) Low-density plasmas where the Debye sheath from the SC will interfere with probe measurements; ii) flowing plasmas where asymmetric current collection causes characterization of the density; iii) high-surface-emission environments where photoemission from the probe or SC will pollute the measurements of the ambient plasma.

English

ISBN: 9798557021289Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Debye Sheath

Advancement of Space Plasma Measurements with Novel Langmuir Probe Technologies /
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520 $a Langmuir probes have been flown on spacecraft missions for in-situ measurements of the local plasma environment from sounding rocket missions to flagship missions like Cassini or Rosetta over the past 50 years. Langmuir probes are conductors of simple geometries (spheres, disks, cylinders, etc.) inserted into a plasma. By sweeping a voltage on the probe and measuring the current collected or emitted, a current-voltage (I-V) relationship can be found and interpreted to derive the density, temperature, and potential of the ambient plasma. However, even after decades of use, there are still challenges in the analysis and interpretation of Langmuir probe measurements due to non-ideal plasma environments encountered by or created by the spacecraft.In the upper atmospheres of planets atomic oxygen is present in high densities capable of degrading the probe surface, warping the I-V curve of a Langmuir probe or otherwise causing a the probe to incorrectly measure the plasma. Due to plasma interactions with the probe itself and spacecraft there is often an anisotropic or inhomogeneous plasma environments. The following dissertation summarizes the research to find probe coatings whose measurements are least affected by atomic oxygen as well as the construction of a double hemisphere Langmuir probe (DHP) to improve space plasma measurements in: i) Low-density plasmas where the Debye sheath from the SC will interfere with probe measurements; ii) flowing plasmas where asymmetric current collection causes characterization of the density; iii) high-surface-emission environments where photoemission from the probe or SC will pollute the measurements of the ambient plasma.
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650 4 $a Plasma physics. $3 3175417
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653 $a Double Hemispherical Langmuir Probe
653 $a Ionosphere
653 $a Langmuir Probes
653 $a Magnetosphere
653 $a Spacecraft
690 $a 0605
690 $a 0759
710 2 $a University of Colorado at Boulder. $b Physics. $e degree granting institution. $3 3765727
720 1 $a Horanyi, Mihaly $e degree supervisor.
720 1 $a Wang, Xu $e degree supervisor.
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