Search Publications
Propagation of interplanetary shocks through the solar wind and magnetosheath
Němeček, Z.; Šafránková, J.; Přech, L. +1 more
In order to estimate the propagation of interplanetary (IP) shocks in the solar wind and magnetosheath, we have analyzed a number of events for which simultaneous observations in the solar wind and magnetosheath were available. Among these events, those for which the arrival of the shock is observed by at least four spacecraft located in the solar…
CLUSTER spacecraft observation of a thin current sheet at the Earth’s magnetopause
Fränz, M.; Dandouras, I.; Khotyaintsev, Y. +7 more
On March 30, 2002 within 17 min the four CLUSTER spacecraft crossed the Earth’s high-latitude magnetopause three times. We found that all three magnetopause current sheets are nearly co-planar on the scales of the CLUSTER spacecraft separation. The thickness of the current sheets changes from 1 to 40 magnetosheath-proton thermal gyro-radii. The th…
ISS-SOLAR: Total (TSI) and spectral (SSI) irradiance measurements
Fröhlich, C.; Thuillier, G.; Schmidtke, G.
The primary objective of the ISS-SOLAR mission on Columbus (to be launched in 2006) is the quasi-continuous measurement of the solar irradiance variability with highest possible accuracy. For this reason the total spectral range will be recorded simultaneously from 3000 to 17 nm by three sets of instruments: SOVIM is combining two types of absolut…
The extreme Halloween 2003 solar flares (and Bastille Day, 2000 Flare), ICMEs, and resultant extreme ionospheric effects: A review
Tsurutani, B. T.; Judge, D. L.; Gonzalez, W. D. +5 more
Extreme solar flares can cause extreme ionospheric effects. The Oct 28, 2003 flare caused a ∼25 TECU (a total electron content unit is 10 16 electron/m 2 column density), or a ∼30%, increase in the local noon equatorial ionospheric column density. This enhancement occurred within ∼5 min. This TEC increase was ∼5 times the TEC…
Cassini observations of the Interplanetary Medium Upstream of Saturn and their relation to the Hubble Space Telescope aurora data
Dougherty, M. K.; Jackman, C. M.; Clarke, J. T. +3 more
We present Cassini magnetometer and plasma data for the January 2004 ‘solar wind campaign’ in which the particles and fields instruments monitored the solar wind and interplanetary magnetic field, while the Hubble Space Telescope (HST) simultaneously observed the UV aurora in Saturn’s southern ionosphere. Clear structuring is evident in the data w…
The role of the Hall effect in collisionless magnetic reconnection
Nakamura, R.; Scholer, M.; Runov, A. +2 more
A short review of the role of the Hall effect in collisionless reconnection is given in relation to observations in the upper auroral ionosphere during substorm-reconnection events. We clarify the conditions when the Hall effect should be of importance and when the ion inertial length is the responsible scale which is the case for β⊥ &g…
Calibration of space instrumentation with synchrotron radiation
Richter, M.; Gottwald, A.; Scholze, F. +2 more
For many years, synchrotron radiation as emitted from electron storage rings has been established as a versatile tool for photon metrology in the spectral range from ultraviolet radiation to X-rays. In particular, various radiometric techniques have been developed and applied for the calibration of space instrumentation. In this context, the prese…
Magnetic reconfiguration before the X 17 Solar flare of October 28 2003
Mandrini, C. H.; Schmieder, B.; Démoulin, P. +3 more
An active region (AR) NOAA 10486, which produced a large number of X-ray flares during October November 2003, was observed during a multi-wavelength campaign with ground based and space instruments. We focus our analysis on the observations of October 28, 2003. The magnetic field was observed with THEMIS (Na D1) and MDI (Ni I), the chromosphere wi…
NRLEUV 2: A new model of solar EUV irradiance variability
Warren, Harry P.
NRLEUV represents an independent approach to modeling the Sun's EUV irradiance and its variability. Instead of relying on existing irradiance observations, our model utilizes differential emission measure distributions derived from spatially and spectrally resolved solar observations, full-disk solar images, and a database of atomic physics parame…
Cluster satellite observations of mHz pulsations in the dayside magnetosphere
Glassmeier, K. -H.; Blomberg, L. G.; Eriksson, P. T. I.
On 17 August 2002 the Cluster spacecraft moved through the dayside magnetosphere. Between 16:00 and 18:30 UT clear monochromatic oscillations are seen in both electric field and magnetometer data. The frequency is 4.2 mHz in the spacecraft frame of reference. The oscillations have a clear spatial localisation. The magnetic field oscillations are r…