Search Publications
Observations of cosmic ray electrons and positrons during the early stages of the A- magnetic polarity epoch
Clem, John; Evenson, Paul
As part of our ongoing investigation of the charge sign dependence in solar modulation, we measured the cosmic ray positron abundance (0.8 GeV to 4.5 GeV) and electron flux (20 MeV to 4.5 GeV) on balloon flights from Lynn Lake, Manitoba during August 2002. We find that the decrease in the positron abundance observed in 2000 persists in 2002. The l…
Correlation between suprathermal electron bursts, broadband extremely low frequency waves, and local ion heating in the midaltitude cleft/low-latitude boundary layer observed by Cluster
Balogh, A.; RèMe, H.; Fazakerley, A. N. +9 more
The Cluster spacecraft often cross the midaltitude cleft/cusp and observe a very well defined "electron-only cleft" region consisting of electron injections without magnetosheath ions. This region contains soft suprathermal (<500 eV) electron bursts in antifield and/or field-aligned directions. We present an example of such observations which s…
Anisotropy and Alfvénicity of hourly fluctuations in the fast polar solar wind
Neugebauer, M.
Ulysses magnetic and plasma data obtained in the fast polar solar wind are used to study the nature of fluctuations in the frequency range between the turbulent inertial range and the lower-frequency range dominated by quasi-static structures originating at the Sun. For daily variations of hourly averages of the magnetic field components the aniso…
Heliospheric energetic particle observations by the Cassini spacecraft: Correlation with 1 AU observations
Livi, S.; Dougherty, M. K.; Lario, D. +3 more
We present energetic particle measurements from the Low-Energy Magnetospheric Measurement System (LEMMS) on board the Cassini spacecraft during its heliospheric cruise to Saturn. We cover 3 years (2000-2002) of data during the maximum of the solar cycle 23. Cassini's heliocentric radial distance ranged from 2.5 to 8.0 AU. Energetic particle intens…
New observations from Cassini and Ulysses of Jovian VLF radio emissions
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +2 more
Simultaneous observations of Jupiter's so-called reradiated VLF radio emission by the Cassini and Ulysses spacecraft confirm that the emission is radiated into all directions in a pulse or strobe light-like fashion. These observations rule out a source that corotates with the planet. Observations of the same VLF emission component during the Cassi…
Remote sensing of possible plasma density bubbles in the inner Jovian dayside magnetosphere
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +4 more
During the 2001 Cassini encounter with Jupiter, the Radio and Plasma Wave Science (RPWS) instrument detected fine spectral and temporal structure with broadband kilometric radiation. Applying known electron cyclotron harmonic radiation models, this microstructure is interpreted as originating from a plasma density depletion or bubble at the edge o…
Global control of merging by the interplanetary magnetic field: Cluster observations of dawnside flank magnetopause reconnection
Balogh, A.; RèMe, H.; André, M. +7 more
Detailed Cluster observations of flank magnetopause reconnection are presented for two events on the Northern and the Southern Hemispheric dawnside flanks when the interplanetary magnetic field (IMF) clock angle ? = arctan(By/Bz) is within ∼45° of the equatorial plane. The event selection is based on the relative proximity be…
Cluster observations of quasi-periodic impulsive signatures in the dayside northern lobe: High-latitude flux transfer events?
Balogh, A.; Khurana, K. K.; Fazakerley, A. N. +4 more
We report on a series of quasi-periodic reversals in GSM BZ observed by the four Cluster spacecraft in the northern dayside lobe poleward of the cusp on 23 February 2001. During an interval of about 35 min, multiple reversals (negative to positive) in BZ of approximately 1-min duration with an approximate 8-min recurrence tim…
Latitudinal transport effects on the modulation of a few-MeV cosmic ray electrons from solar minimum to solar maximum
Fichtner, H.; Wibberenz, G.; Ferreira, S. E. S. +2 more
A three-dimensional, steady state, numerical model was used to model the propagation of 7 MeV jovian and galactic electrons in the heliosphere. The computations are compared with 3-10 MeV Ulysses/KET electron observations which are still not well explained after ∼1998. To explain these observations, coinciding with solar maximum conditions, it is …
A study of the electrical charging of the Rosetta orbiter: 2. Experimental tests in a laboratory plasma
Berthelier, Jean-Jacques; Roussel, Jean-FrançOis
Following the numerical simulation presented in the companion paper, we have performed experimental tests in a plasma simulation chamber to check the results of the numerical model and validate its capability to properly predict the electrical equilibrium of the Rosetta orbiter. Since low temperature cometary plasmas cannot be directly reproduced …