Zobrazeno 1 - 10
of 36
pro vyhledávání: '"M. H. Boehm"'
Autor:
C. W. Carlson, L. M. Kistler, David Klumpar, Robert E. Ergun, Eberhard Möbius, J. P. McFadden, M. H. Boehm
Publikováno v:
Scopus-Elsevier
Observations of 0.01–10 keV ions at a discrete set of velocities, as expected for ions bouncing repeatedly between hemispheres, have been previously reported both at low altitudes and at geosynchronous orbit. The following two possible models of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37f795812664987e25d0a07eda62514f
https://doi.org/10.1029/98ja02290
https://doi.org/10.1029/98ja02290
Publikováno v:
Journal of Geophysical Research: Space Physics. 103:9391-9404
We have used data from the Freja satellite, with an apogee of 1700 km over the auroral oval, to make a statistical analysis of mesoscale auroral plasma density cavities. Such cavities are defined to be regions in the auroral zone with size scales bet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e545a0ad124ee270f10a3c1517755c2
https://doi.org/10.1029/98ja00212
https://doi.org/10.1029/98ja00212
Novel Measurement of the Pitch-Angle Structure of Auroral Electron Beams with a Top Hat Spectrometer
Publikováno v:
Measurement Techniques in Space Plasmas: Particles
Described is a technique used by the Freja TESP top hat-style electron spectrometer to measure rapidly the structure of field-aligned electron beams. The technique utilizes the instrument's entrance aperture deflector to sweep the look direction acro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::238dfa09e4e2a336f70c4a9fc0a90115
https://doi.org/10.1029/gm102p0169
https://doi.org/10.1029/gm102p0169
Publikováno v:
Measurement Techniques in Space Plasmas: Particles
The top-hat electron spectrometer and correlator on Freja acquired distribution function data at a rate equal to ∼20 times the available telemetry rate. This data rate was reduced by a factor ∼15 through data selection, encoding as (counts/ms) 0.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19dbd6ed0f7b41698828d85406b3fd4d
https://doi.org/10.1029/gm102p0181
https://doi.org/10.1029/gm102p0181
Autor:
J. H. Clemmons, Gerhard Haerendel, Harald U. Frey, D. D. Wallis, J Vogt, H. Lühr, E. Rieger, M. H. Boehm, Otto H. Bauer
Publikováno v:
Advances in Space Research. 18:107-110
During two Freja passes over auroral arc systems special wide-angle CCD cameras were operated from the ground. Comparisons of the optical observations with satellite-measured plasma parameters are performed. Motions of fine structures of the arcs are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::961bf64aeaea234d50513e2455c93047
https://doi.org/10.1016/0273-1177(95)00971-x
https://doi.org/10.1016/0273-1177(95)00971-x
Publikováno v:
Geophysical Research Letters. 22:69-72
A ∼2-ms transition in auroral electron precipitation observed by the TESP electron spectrometer on Freja is described. The lack of significant pitch-angle dependent velocity dispersion in the observations implies that the transition is a ∼10-m sp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf5f49d72824e56371788de8cfa8cb16
https://doi.org/10.1029/94gl02555
https://doi.org/10.1029/94gl02555
Autor:
K. Lundin, S. Olsen, Brian A. Whalen, Lars Eliasson, H. Borg, M. H. Boehm, P. Riihela, O. Norberg, Rickard Lundin, Hannu Koskinen, Mats André
Publikováno v:
Space Science Reviews. 70:563-576
The Hot Plasma Experiment, F3H, on board Freja is designed to measure auroral particle distribution functions with very high temporal and spatial resolution. The experiment consists of three different units; an electron spectrometer that measures ang
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68a0256f0ec06d07a492541755a00bf8
https://doi.org/10.1007/bf00756886
https://doi.org/10.1007/bf00756886
Autor:
Brian A. Whalen, N. D. Lloyd, David J. Knudsen, Anders Eriksson, Andrew W. Yau, M. H. Boehm, M. Greffen, J. H. Clemmons, Lars Blomberg
Publikováno v:
Geophysical Research Letters. 21:1907-1910
We present Freja Cold Plasma Analyzer (CPA) measurements from an encounter with the low altitude (∼1750 km) polar cusp during which the CPA measured 2-D images of the thermal (0–16 eV) particle distributions at 1.2 s time resolution, and simultan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6db3623b073f65b4677ae4266372ace5
https://doi.org/10.1029/94gl00887
https://doi.org/10.1029/94gl00887
Autor:
D. D. Wallis, H. Lühr, Gerhard Haerendel, M. H. Boehm, E. Rieger, Harald U. Frey, J. H. Clemmons, Otto H. Bauer
Publikováno v:
Geophysical Research Letters. 21:1891-1894
The paper reports data received from the Freja satellite during two passes over broad auroral arc systems or inverted-V events above Gillam/Manitoba when special wide-angle CCD cameras were operated at this location in addition to the CANOPUS network
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81ff917e689c9cc026090d68ef830264
https://doi.org/10.1029/94gl01692
https://doi.org/10.1029/94gl01692
Autor:
O. Norberg, Anders Eriksson, M. H. Boehm, Lars Eliasson, Mats André, B. Holback, H. Borg, Hannu Koskinen, Patrik Norqvist, Rickard Lundin
Publikováno v:
Geophysical Research Letters. 21:1911-1914
The experiments on board Freja are designed to measure auroral particle energization processes with very high temporal and spatial resolution. One main scientific objective is to study ion heating transverse to the magnetic field lines in the auroral
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::252887b65883e6b2e6b5610036511b68
https://doi.org/10.1029/94gl01067
https://doi.org/10.1029/94gl01067