Variations of energetic ions flux in the foreshock
Variations of energetic ions flux in the foreshock
Monday, 10 July 2017: 11:45
Furong Room (Cynn Hotel)
Abstract:
Periodic variations of energetic ion fluxes
were recently dicsovered in the Earth's foreshock with the new spacecraft
spectrometers MEP/Spectr-R and SST/THEMIS, having suffiently high time resolution.
The periods were 10-100 sec, variations were in phase in the broad energy range 4-400 keV.
Variations can be observed upstream as far as Moon orbit,
but most often right away from the shock.
These events are identified as a feature of "30-sec" upstream waves,
but magnetic waves are usually non-linear and solar wind speed is usually high
(more than 450 km/s)
We present examples from MEP/Spectr-R and SST/THEMIS data,
analyze statistics of occurrence, compare with the other
foreshock datasets, as well as discuss origins of such variations
and the foreshock dependence on solar wind speed.
were recently dicsovered in the Earth's foreshock with the new spacecraft
spectrometers MEP/Spectr-R and SST/THEMIS, having suffiently high time resolution.
The periods were 10-100 sec, variations were in phase in the broad energy range 4-400 keV.
Variations can be observed upstream as far as Moon orbit,
but most often right away from the shock.
These events are identified as a feature of "30-sec" upstream waves,
but magnetic waves are usually non-linear and solar wind speed is usually high
(more than 450 km/s)
We present examples from MEP/Spectr-R and SST/THEMIS data,
analyze statistics of occurrence, compare with the other
foreshock datasets, as well as discuss origins of such variations
and the foreshock dependence on solar wind speed.