About technique of alignment and stacking of TGF

About technique of alignment and stacking of TGF 24 September 2014, TEPA-2014 Vybornov V. Pozanenko A. Your Minaev P. Name Your Title Space Research Institute Your Organization (Line #1) Moscow, Russia Your Organization (Line #2)

Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) Launched in 2002 9 germanium detectors Energy band 3 ke. V — 17 Me. V Orbit: 600 км, 38° Spectral resolution 3 ke. V at ~1 Me. V Write each photon Scientific goals: Investigation of physics of solar flares and penetration accelerated particles from the Sun Investigation of gamma-ray bursts 2

Idea of stacking method Problem: Each event has too little number of counts to build time profile and spectrum Method: Counts stacking to increase statistics (under assumption that all events have the same nature) pluses: there is possibility to build and study averaged time profile and spectrum in any event group minuses: lose information about each event and its individual features Example event from the RHESSI TGF catalog 3

Stacking method: moving total Moving total of counts with window 0. 2 ms window 4

Stacking method: search of event center search central time of event in window with max. number of counts t 0 Window with max. numbers of counts calculating central time 5

Stacking method: event alignment Alignment the event from of event central time 6

Stacking method: stacking + + normalized time profile 7

Stacking method: check method correctness If resulting time profile is averaged time profile? . . . normalized time profile ? ≈ hypothetical time profile + + +. . . N 8

Stacking method: Monte-Carlo simulation of event like TGF Function of non-homogeneous Poisson process rate + + normed time profile +. . . Event as a non-homogeneous Poisson process Lewis & Shedler, 1978 9

Stacking method: Monte-Carlo simulation of event like TGF real simulated 10

Stacking method: test the method Dependence of stacking method error from event power correspond to faintest group in the catalog 11

Results A method of building of time profiles and spectra of TGF based on event stacking has been worked out Method correctness was tested in Monte-Carlo simulation Error of the method for faintest TGFs from the RHESSI catalog is no more then 10% 12

Thank you for attention! 13