the december 2006 sep events at high heliospheric latitudes the ket ulysses observations
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The December 2006 SEP Events at High Heliospheric Latitudes: the KET/ Ulysses Observations. A. Struminsky ( [email protected] ) , I. Zimovets, Institute of Space Research, Moscow, Russia. B. Heber, R. Mueller-Mellin, R. Gomez-Herrero, A. Klassen

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the december 2006 sep events at high heliospheric latitudes the ket ulysses observations

The December 2006 SEP Events at High Heliospheric Latitudes: the KET/Ulysses Observations

A. Struminsky ([email protected]), I. Zimovets,

Institute of Space Research, Moscow, Russia.

B. Heber, R. Mueller-Mellin, R. Gomez-Herrero, A. Klassen

Christian-Albrechts-Universität Kiel, Germany.

general review
General review
  • In the upper panel we may distinguish three proton intensity increases within three lower energy channels related to the solar events of December 5, 6 and 13 (arrows). The SEP event of December 14 was observed by GOES but it might be below background at Ulysses.
  • The count rate of the 200-2000 MeV Ulysses channel was normalized to the 165-500 MeV GOES intensity in May-June 2001, when both spacecraft were at heliocentric distances of ~1 AU.
  • The enhancements within the 200-2000 MeV channel is not visible in the logariphmic scale, but two humps would be seen in the linear scale (next slide).
  • Vertical lines shows interplanetary shocks. We do not see any effects of shocks on proton intensity time profiles, excepting the lowest energy channel of 5-25 MeV. The 5-25 MeV protons show some enhancement after the shocks on 345 and 351 days.

Black -5-25 MeV; Red 38-80 MeV; Blue 80-125 MeV; Cyan 250-2000 MeV

comparison with observations at 1 au
Comparison with observations at 1 AU

Red -165-500 MeV GOES

Black -250-2000 MeV Ulysses

  • The largest maximum intensity within 165-500 MeV was registered on December 13, the SEP event accompanied by Ground Level Enhancement (GLE), but the largest event was registered by Ulysses on December 6
  • The onset and time profiles of higher energy channels of Ulysses and GOES coinsided in the December 5 event. A convolution of source and propagation function was identical for protons of ~200 MeV observed during several hours in distant points of the heliosphere. This fact ruled a transport of protons within vicinity of the shock front on December 5!!!
  • A sharp rise of GOES intensity at 20:30 UT (less than two hours after hard X-ray maximum) on December 6 indicates that the Earth has become much better connected to the source than Ulysses.
  • A time scale of two hours corresponds to shock propagation characteristic time and might be reflect a role of the shock transport of SEP to Earth on December 6. Conditions of particle propagation to Ulysses were not changed significantly.
comparison with july 2000 event
Comparison with July 2000 event
  • The KET/Ulysses observations of 250-2000 MeV protons
  • Modulation during the solar cycle of cosmic ray intensities
  • Nearly the same enhancement above background despite solar maximum in 2000 and solar minimum in 2006
comparison with december 2001 event
Comparison with December 2001 event
  • The KET/Ulysses observations of 250-2000 MeV protons
  • Modulation during the solar cycle,
  • Nearly the same enhancement above background
ulysses observations at high latitudes stereo and goes observations at the earth
Ulysses observations at high latitudes & STEREO and GOES observations at the Earth
  • Red – the GOES intensity of 40-80 MeV protons (left log Y-axis)
  • Black – the STEREO intensity of 40-60 MeV protons (left log Y-axis)
  • Blue – the Ulysses intensity of 38-125 MeV protons (left log Y-axis)
  • Cyan – the Ulysses intensity of 250-2000 MeV protons (right linear Y-axis)
ket ulysses observations in december 2006 and september 2000
KET/Ulysses observations in December 2006 and September 2000

September 2000

5-25 MeV – black

38-80 MeV – red

80-125 MeV – blue

December 2006

5-25 MeV – grey

38-80 MeV – yellow

80-125 MeV – cyan

  • The time profiles are shifted to get the same onset time of the 80-125 MeV channel during the compared events.
  • As a result we see a similar time profiles in this energy band till onset of the December 6 event.
  • Contrary, lower energies on December 5 show a time delay in comparison with the 2000 September 12 event. Propagation conditions in December 2006 were complicated.
ket ulysses observations in december 2006 and november 2001
KET/Ulysses observations in December 2006 and November 2001

November 2001

5-25 MeV – black

38-80 MeV – red

80-125 MeV – blue

December 2006

5-25 MeV – grey

38-80 MeV – yellow

80-125 MeV – cyan

  • The time profiles are shifted to get the same onset time of the 80-125 MeV channel during the compared events.
  • As a result we see a similar time profiles in this energy band till onset of the December 6 event.
  • Contrary, lower energies on December 5 show a time delay in comparison with the 2000 September 12 event. Propagation conditions in December 2006 were complicated.
conclusions
CONCLUSIONS
  • Comparison of Ulysses and GOES proton time profiles shows that on 2006 December 5 the proton propagation to high latitudes and distant longitudes for 250-2000 MeV was the same.
  • A propagation of <80 MeV protons was complicated to high latitudes on December 5. This effect has a clear energetic (rigidity?) dependence.
  • A value of the maximum intensity within 38-125 MeV doesn’t contradict to the upper limit characteristic for the previous Ulysses events.
  • The reservoir effect is delayed in comparison with previous cases due to complicated transport to high latitudes in December 2006 and a contribution of several sources to the time profiles.

The Ulysses/KET project is supported under grant No. 50OC0105 by the German Bundesminister für Wirtschaft through the Deutsches Zentrum für Luft- und Raumfahrt (DLR).

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