scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
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STP12 Abstracts<br />
Berlin, 12 - 16 July <strong>2010</strong><br />
SCOSTEP Symposium <strong>2010</strong><br />
The detection possibility of the neutrons from thun<strong>der</strong>storm onboard low-orbit small<br />
satellites.<br />
Drozdov Alex<strong>an</strong><strong>der</strong> , Grigoriev Alex<strong>an</strong><strong>der</strong> , Malyshkin Yuri<br />
Lomonosov Moscow State University Skobeltsyn <strong>Institut</strong>e of Nuclear Physics<br />
The first experimental evidence, that neutrons are generated during thun<strong>der</strong>storms, was found<br />
by Indi<strong>an</strong> scientists [1]. Later, according to the <strong>an</strong>alysis of experimental data on the neutron<br />
flux, obtained onboard the orbital station "MIR" (experiments "Ryabina-2",1990-2000) <strong>an</strong>d<br />
microsatellite "Kolibri" (experiment "Kolibri", 2002) at the altitude of 400 km, it was<br />
concluded that possible correlation of the observed increase of neutron count with<br />
thun<strong>der</strong>storm activity on the Earth c<strong>an</strong> take place [2].<br />
Recent studies show the principal possibility of neutron detection from the thun<strong>der</strong>storms [3].<br />
Confirmation of thun<strong>der</strong>storm neutron detection on orbital altitudes has m<strong>an</strong>y difficulties [4].<br />
In the experiment on microsatellite "Kolibri" the value of the observed increase of neutron<br />
flux was comparable to the background. The total flux of neutrons, detected at the satellite, is<br />
the amount of albedo neutron flux, local neutron flux, <strong>an</strong>d neutron flux from other sources. In<br />
case of small satellites, the local neutron flux is faint [5] <strong>an</strong>d makes no effect on the total<br />
flux. Unlike the local neutron flux, the albedo neutron flux does not depend on the mass of the<br />
satellite. Knowing the value <strong>an</strong>d the characteristics (like latitude flux distribution) of the<br />
albedo neutron flux, we c<strong>an</strong> separate the influence of other neutron sources on the total<br />
neutron flux.<br />
In this work we <strong>an</strong>alyze the contribution of the albedo neutrons on the neutrons detection rate<br />
onboard the satellite <strong>an</strong>d discuss the possibility to single out the thun<strong>der</strong>storm neutron flux.<br />
The neutron tr<strong>an</strong>sport in the atmosphere from the Earth to orbital altitudes was calculated<br />
using the Ge<strong>an</strong>t4 Monte-Carlo simulation.<br />
References:<br />
1. Shah G.N., Razd<strong>an</strong> H., Bhat C.L., Ali Q.M., Neutron generation in lightning bolts //<br />
Nature. 1985. V. 313. p. 773 – 775.<br />
2. Bratolyubova-Tsulukidze L.S., et al., Thun<strong>der</strong>storm as the probable reason of high<br />
background neutron fluxes at L < 1.2 // Adv. Space Res. 34. 2004. p. 1815-1818.<br />
3. Grigoriev A.V., Drozdov A.Yu. , et al., Thun<strong>der</strong>storm Neutrons at Altitudes up to 400<br />
km: Theoretical Estimations <strong>an</strong>d Numerical Simulation // J. Geophys. Res. <strong>2010</strong>., in<br />
print.<br />
4. Drozdov A.Yu., Grigoriev A.V., et al., Experiment Based On Spacesuit "Orl<strong>an</strong>-M".<br />
Neutron Fluxes From Thun<strong>der</strong>storm // J. Geophys. Res. <strong>2010</strong>., in print.<br />
5. P<strong>an</strong>asyuk M.I., et al., Modeling of neutron fluxes on near-earth spacecraft's from the<br />
experimental results of SINP // Proceedings of the RADECS Workshop Summary,<br />
Belgium. 2000. p. 15-18
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