Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Åshild Fredriksen"'
Publikováno v:
IEEE Transactions on Plasma Science. 48:4298-4304
The effective temperatures of the positive and negative charge carriers in impact plasma are measured experimentally. The measurements are performed using a dust accelerator using polypyrrole (PPy)-coated olivine dust particles impacting onto a tungs
Autor:
Pascal Sado, Åshild Fredriksen
Publikováno v:
IEEE Transactions on Plasma Science. 48:4181-4190
The exhaust ion stream from an electron cyclotron resonance (ECR) plasma source is investigated in detail. Two sets of coils allow for different shapes of the external field under which the plasma is created. Parameters in the form of electron densit
Publikováno v:
Annales Geophysicae, Vol 39, Pp 533-548 (2021)
We investigate the generation of charge due to collision between projectiles with sizes below ∼1 µm and metal surfaces at speeds ∼0.1 to 10 km s−1. This corresponds to speeds above the elastic limit and well below speeds where volume ionizatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b844cceb818c2306eba1ffb9f00550a
https://hdl.handle.net/10037/23589
https://hdl.handle.net/10037/23589
Autor:
Åshild Fredriksen, Alexander Biebricher, Martin Friedrich, Ove Havnes, Thomas W. Hartquist, Jonas Hedin, Gerd Baumgarten, Tarjei Antonsen
Publikováno v:
Atmospheric Measurement Techniques, Vol 12, Pp 1673-1683 (2019)
Source at https://doi.org/10.5194/amt-12-1673-2019. We present a new method of analyzing measurements of mesospheric dust made with DUSTY rocket-borne Faraday cup probes. It can yield the variation in fundamental dust parameters through a mesospheric
We experimentally observe both positive and negative charge carriers in impact plasma and estimate their effective temperatures. The measurements are carried on a dust accelerator using polypyrrole (PPy)-coated olivine dust particles impacting tungst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a6e414699d5cd9b0630f61be07d5275
https://doi.org/10.5194/egusphere-egu21-14909
https://doi.org/10.5194/egusphere-egu21-14909
We investigate the generation of charge during collision of projectiles with sizes below ~ 1 μm and metal surfaces at speeds ~ 0.1 km/s. This corresponds to speeds above the elastic limit and well below speeds where volume ionization can occur. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b28801cc8383b574b4aee64f1eff3e3
https://doi.org/10.5194/angeo-2020-23
https://doi.org/10.5194/angeo-2020-23
Impact ionization is a process of plasma generation upon hypervelocity impact of a small body (e.g., interplanetary dust grain) onto a solid surface. Such process may play an important role in astrochemistry. Understanding the plasma generation, we c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1b55e3262ffc6a38e9c321172b13308
https://doi.org/10.5194/egusphere-egu2020-3095
https://doi.org/10.5194/egusphere-egu2020-3095
Autor:
Zoltan Sternovsky, Libor Nouzak, Mihaly Horanyi, Michael DeLuca, Samuel Kočiščák, Shengyi Ye, Åshild Fredriksen, David M. Malaspina, Sean Hsu, Ming-Hsueh Shen
Antenna instruments on space missions have been used to detect dust particles and characterize dust populations. The antennas register the transient electric signal generated by the expansion of the impact plasma from the dust impact on the spacecraf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd7fd166217169685777626828bf7d42
https://doi.org/10.5194/egusphere-egu2020-1805
https://doi.org/10.5194/egusphere-egu2020-1805
Anomalous transport due to large coherent structures, or coherent events, is studied experimentally in a magnetized toroidal discharge plasma. The present analysis emphasizes anomalous plasma losses as well as transport of electron thermal energy den
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9890140fcba46a052f3708ccb0f49a0
https://hdl.handle.net/10037/21366
https://hdl.handle.net/10037/21366
Publikováno v:
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA).
CFDLs are sharp potential drops that can form self-consistently without external current forcing, in helicon plasma sources with an expanding magnetic field. The potential drop typically occurs in the transition between the source and the diffusion c