DIRECTIONAL CAPABILITIES OF SOHO INSTRUMENTATION
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1 1 DIRECTIONAL CAPABILITIES OF SOHO INSTRUMENTATION ERNE
2 2 OUTLINE Measurement principle Data production Contents of SEPServer data Example event(s)
3 3 Measurement principle SOHO/ERNE/HED
4 4 ERNE is looking to the nominal IP magnetic field line direction θ = tan 1 Δx 2 + Δy 2 31 φ = tan 1 Δy Δx
5 5 Directional bins: 240/241
6 6 SOHO rolls: 180 degree roll around the Sun pointing axis Since July 8, 2003 Twice per orbit = every 3 months
7 7 Data production Likelihood distribution for intensities inferred from Poisson distributed counts Intensities calibrated and normalized to standard units of 1/(cm 2 s sr MeV) Intensities include bin-dependent multipliers a ij (calibration constant) accounting for various instrumental effects Probability distribution of intensities assuming log-normal distribution is I i,j ~N(μ Iij + μ aij, σ 2 Iij + σ 2 aij ) Data smoothed temporally and directionally Covariance between measurements with temporal and angular-dependent Gaussian weights Smoothed intensities calculated for all 241 bins
8 8 Contents of SEPServer data Defined in SEP Data Delivery Plan Time (Year, DOY, ms from the beginning of day, TAI, integration time (= 4 minutes)) Energy channel OSS version SOHO roll angle Anisotropy index and its variance Intensity and intensity variance in each bin Counts in each bin Anisotropy index defined as the difference between the 85 th and 15 th percentile values of a measurement Useful for quick-look of possible anisotropy as function of time
9 9 Directional bins and energy ranges for various versions of on-board science software OSS Version Dates in use OSS OSS OSS OSS OSS present and later Directional bins in semi-circular aperture Circular centre area and 9 concentric rings divided in 16 azimuth sectors Circular centre area and 9 concentric rings divided in 24 azimuth sectors One circular centre area surrounded by 10 concentric rings divided in 24 azimuth sectors Species and energy ranges (MeV/nucleon) Protons 17-22, 21-28, Helium 17-28, 26-51, Protons , , , 27-50, Helium 64-80
10 10 Example event: June 10, 2001 Movie from 17:20 UT to 21:16 UT
11 11 A very simple presentation of anisotropy View cone division in four quadrants Q2 Q1 Q3 Q4
12 12 Intensities of individual quadrants Q2 Q4 Q3 Q1
13 13 Anisotropy index and intensity ratio Q4/Q2
14 14 Ratio of Q4-to-Q2 intensity Anisotropy index
15 15 p MeV p MeV p MeV p MeV p MeV He MeV/n
16 16 p MeV p MeV p MeV p MeV
17 17 Colour-coded intensities SEP event June 10, 2000 (SEPServer event n:o 0030) June 10 June 14 Q1 Q2 Q3 Q4 17:20 UT 21:20 UT Q1 Q2 Q3 Q4
18 18 Example event: September 12, 2001 Movie from 13:22 UT to 19:58 UT
19 19 More detailed directional divisions for SEPServer?
20 20 8 sectors
21 21 24 sectors
22 22...and n+1 rings. Until we will have...
23 23 well... two hundred and forty one bins How to present them? Movies availabale only for a few events
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