Post on 15-Jan-2016
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SEP Data Analysis and Data Products for EMMREM
SEP Data Analysis and Data Products for EMMREM
Mihir I. Desai & Arik Posner
Southwest Research Institute San Antonio, Texas
Mihir I. Desai & Arik Posner
Southwest Research Institute San Antonio, Texas
Time-intensity profiles of 0.1 - 500 MeV protons during the 2003 October-November storms
Time-intensity profiles of 0.1 - 500 MeV protons during the 2003 October-November storms
Solar event associations, Flare/CME properties
Solar event associations, Flare/CME properties
Proton, Helium & Oxygen fluences for an SEP event
Proton, Helium & Oxygen fluences for an SEP event
Longitudinal Distribution of large gradual SEPs
Longitudinal Distribution of large gradual SEPs
Cane et al (1986)
Multi-spacecraft observationsMulti-spacecraft observations
Kallenrode et al. 1993 (Solar Physics).
STEREO will characterize the azimuthal distribution of SEP
Properties
STEREO will characterize the azimuthal distribution of SEP
Properties
Instruments & Energy coverageInstruments & Energy coverage
Table 1: Instruments and Energy Coverage Energy Range
(MeV or MeV/nucleon)
S/C Instr. Ions (H/He – Fe)
Electrons
ACE ULEIS 0.04 – 9.7 … ACE SIS 7.0 –90 …
SAMPEX PET 19 – 400 1.2 – 8.0 GOES EPS 0.8– 500 0.6 - >2 Wind STICS 0.006 – 0.2 … Wind STEP 0.02 – 2 … SoHO COSTEP 4 – 150 0.2 – 15
STEREO SEPT 0.02 – 7.0 0.02 – 0.4 STEREO SIT 0.03 – 2.0 … STEREO LET 1.5 – 30 … STEREO HET – 100 – 5.0 Ulysses KET 4 to >2000 2 to >10
LRO CRaTER LET (~1 to >100)
MSL RAD ~2-200 0.15-15 Odyssey MARIE LET
(1-30 keV/ m)
Add other datasets: e.g, SoHO/ERNE;Messenger
Add other datasets: e.g, SoHO/ERNE;Messenger
SEP Analysis & Products for EMMREM
SEP Analysis & Products for EMMREM
• Event lists, and products for inputs into module━ Time-histories━ Energy Spectra━ Peak Intensities ━ Format (?)
• Radial and Longitudinal Distributions━ Moon orbit━ Mars━ Radial Alignment━ Longitudinal extrapolation (how without SEP
propagation)
• Validation using MSL/RAD; LRO/CRaTER
• Kahler et al. (late 1970s and early 1980s) found strong correlation with CMEs
• Cane et al. (1986) made association with 2 types of radio bursts
Solar Energetic Particles (SEPs)
Solar Energetic Particles (SEPs)
only flares
Old picture - up to 1990s’
Current picture - two classes
• First discovered - Forbush 1946 from ground based ion counters
• Closely related to H flares - (Meyer 1956)
Where?At CME-shocks or in flares
Source material?Ambient corona, solar wind, or other
Mechanisms?Reconnection or CME-shock acceleration
Transport to Earth?Scattering, Turbulence, fluctuations
SEPs: Big QuestionsSEPs: Big Questions
QuickTime™ and aYUV420 codec decompressor
are needed to see this picture.
Two-Class Picture - 70’s-90’sTwo-Class Picture - 70’s-90’s
Reames (1995)
Wild et al. (1963)
Lin (1970)
Pallavacini et al (1974)
Kahler et al. (1978)
Mason et al. (1984; 1986)
Cane et al. (1986; 1988; 1991)
Reames 1988; 1995; 1999)
Encounter Encounter suprathermal suprathermal material in the material in the corona and the corona and the IP mediumIP medium
486CME shocksCME shocks
(Mason et al. 1999 ApJ, 525, L133).
Emerging Picture - since-90’sEmerging Picture - since-90’sTwo-stage acceleration process
STEP 1: Production of a suprathermal seed populations
STEP 2: Acceleration at CME-driven shocks
Image Credit: ILWS Sentinels Science Definition Team Report