Correlation of upper-atmospheric 7Be with solar energetic particle events

被引：13

作者：

Phillips, GW ^{[1
]}

Share, GH

King, SE

August, RA

Tylka, AJ

Adams, JH

Panasyuk, MI

Nymmik, RA

Kuzhevskij, BM

Kulikauskas, VS

Zhuravlev, DA

Smith, AR

Hurley, DL

McDonald, RJ

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119899, Russia

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2001年 / 28卷 / 05期

关键词：

D O I：

10.1029/2000GL012518

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A surprisingly large concentration of radioactive Be-7 was observed in the upper atmosphere at altitudes above 320 km on the LDEF satellite that was recovered in January 1990. We report on follow-up experiments on Russian spacecraft at altitudes of 167 to 370 km during the period of 1996 to 1999, specifically designed to measure Be-7 concentrations in low earth orbit. Our data show a significant correlation between the Be-7 concentration and the solar energetic proton fluence at Earth, but not with the overall solar activity. During periods of low solar proton fluence, the concentration is correlated with the galactic cosmic ray fluence. This indicates that spallation of atmospheric N by both solar energetic particles and cosmic rays is the primary source of Be-7 in the ionosphere.

引用

页码：939 / 942

页数：4

共 16 条

[1] PRODUCTION OF RESIDUAL NUCLEI BY PROTON-INDUCED REACTIONS ON C, N, O, MG, AL AND SI [J].

BODEMANN, R ;

LANGE, HJ ;

LEYA, I ;

MICHEL, R ;

SCHIEKEL, T ;

ROSEL, R ;

HERPERS, U ;

HOFMANN, HJ ;

DITTRICH, B ;

SUTER, M ;

WOLFLI, W ;

HOLMQVIST, B ;

CONDE, H ;

MALMBORG, P .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1993, 82 (01) :9-31

[2] OBSERVATION OF BE-7 ON THE SURFACE OF LDEF SPACECRAFT [J].

FISHMAN, GJ ;

HARMON, BA ;

GREGORY, JC ;

PARNELL, TA ;

PETERS, P ;

PHILLIPS, GW ;

KING, SE ;

AUGUST, RA ;

RITTER, JC ;

CUTCHIN, JH ;

HASKINS, PS ;

MCKISSON, JE ;

ELY, DW ;

WEISENBERGER, AG ;

PIERCEY, RB ;

DYBLER, T .

NATURE, 1991, 349 (6311) :678-680

[3] Atmospheric radioactive isotopes at orbital altitudes [J].

Gregory, JC .

RADIATION MEASUREMENTS, 1996, 26 (06) :841-850

[4]

IOANNIDOU A, 1994, NUCL GEOPHYS, V8, P539

[5] 478-KEV AND 431-KEV LINE EMISSIONS FROM ALPHA-ALPHA REACTIONS [J].

KOZLOVSKY, B ;

RAMATY, R .

ASTROPHYSICAL JOURNAL, 1974, 191 (01) :L43-L44

[6]

KUSHEVSKIJ BM, 1997, J MOSCOW PHYS SOC, V7, P7

[7]

Lal D., 1967, Kosmische Strahlung II/Cosmic Rays II, V9, P551, DOI DOI 10.1007/978-3-642-46079-1_7

[8]

Lin RP, 2000, ASTR SOC P, V206, P1

[9] Terrestrial cosmogenic-nuclide production systematics calculated from numerical simulations [J].

Masarik, J ;

Reedy, RC .

EARTH AND PLANETARY SCIENCE LETTERS, 1995, 136 (3-4) :381-395

[10] The Ultra-Low-Energy Isotope Spectrometer (ULEIS) for the ACE spacecraft [J].

Mason, GM ;

Gold, RE ;

Krimigis, SM ;

Mazur, JE ;

Andrews, GB ;

Daley, KA ;

Dwyer, JR ;

Heuerman, KF ;

James, TL ;

Kennedy, MJ ;

Lefevere, T ;

Malcolm, H ;

Tossman, B ;

Walpole, PH .

SPACE SCIENCE REVIEWS, 1998, 86 (1-4) :409-448

← 1 2 →