Ngụkọta nke electron

Ngụkọta nke electron (TEC) bụ ihe dị mkpà na-akọwa màkà ionosphere nke ụwa. TEC bụ ngụkọta ọnụ ọgụgụ nkè electrons jikọtara n'etiti isi abụọ, n'akụkụ tube nke otu mita square cross section, ya bụ, ọnụọgụ ọnụọgụ nké electron. A na-akọkarị ya n'ọtụtụ nkè a na-akpọ TEC unit, akọwapụtara dị ka TECU=1016el/m2≈1.66×10−8 mol⋅m−2.^[1]

TEC dị mkpà n'ịkọwapụta scintillation na ìgwè na ógè igbu oge nke ebili mmiri redio site na ónyé na-ahụ màkà ya. A na-akọwa Ionospheric TEC site n'ịhụ oge igbu oge nke mgbaàmà redio natara site na satellites dị n'elu ionosphere, na-ejikarị satellites Global Positioning System. Ọrụ anyanwụ na-emetụta TEC nke ukwuu.

Nkọwa

TEC na-adabere n'ụzọ. Site na nkọwa, enwèrè ike ịgbakọ ya site na ijikọta n'ụzọ ds site na ionosphere nà ọnụọgụ electron _na-adabere na ọnọdụ ne(s):

TEC =

\int n_{e}(s)\,ds

A na-ekpebi TEC kwụ ọtọ (VTEC) site na njikọta nkè njupụta electron na ụzọ kwụ ọtọ n'ala, a na-enweta TEC (STEC) site n'ijikọta n'ụzọ ọ bụla kwụ ọtọ.

Ogologo oge mgbasa

Na usoro mbụ, mmetụta mgbasa ozi redio ionospheric kwekọrọ na TEC ma kwekọọ na frequency redio f. Ógè ionospheric na-egbu oge mà e jiri ya tụnyere mgbasa na ikuku na-agụ:: eq. (9.41)

\tau _{p}^{\mathrm {iono} }=-\kappa {\frac {\mathrm {TEC} }{f^{2}}}

ébé igbu ógè nke ìgwè ionospheric nwèrè otu oke ma ihe ịrịba ama dị iche:

\tau _{g}^{\mathrm {iono} }=-\tau _{p}^{\mathrm {iono} }

A na-egosipụtakarị igbu ógè ionospheric na nkeji nke ogologo (mita), na-eche na igbu ógè (na sekọnd) mụbara site na ọsọ nké ìhè (na m / s). Nkọwa na-adịgide adịgide κ na-agụ:: eq.(9.21), (9.20), (9.19), (9.14)^[2]

\kappa =q^{2}/(8\pi ^{2}m_{e}\epsilon _{0})=c^{2}r_{e}/(2\pi )

ebe q, m, re bụ ụgwọ electron, oke, na radius, n'otu n'otu; c bụ ọsọ ọsọ nke ìhè _na ε0 bụ ikike ikuku. Uru nke ihe na-adịgide adịgide bụ ihe dịka κ ≈ 40.308193 m3·s−2; enwèrè ike igosipụta nkeji ndị ahụ dịka m·m2·Hz2 iji mee ka nkwụsịtụ na-emetụta igbu oge τ na mita pụta ìhè, nyéré f na Hz na TEC na m−2.

A na-egosipụta ụkpụrụ ehihie nke TEC na nha site na efu ruo TEC otu narị. Otú ọ dị, enwèrè ike iwepụta obere ọdịiche nke 0.1-0.5 TEC nkeji n'okpuru echiche nke echiche na-adịgide adịgide.^[3] Obere ọdịiche TEC ndị a nwèrè njikọ na nsogbu ionospheric na-agagharị agagharị (MSTIDs).^[4]

Edensibia

↑ B. Hofmann-Wellenhof (2001). Global Positioning System: Theory and Practice. New York: Springer-Verlag. ISBN 978-3-211-83534-0.
↑ https://books.google.com/books?id=9X5gy_mDamsC&pg=PA360 , eq.(25.5)
↑ van de Kamp (2014-12-17). "TID characterized using joint effort of incoherent scatter radar and GPS" (in en). Annales Geophysicae 32 (12): 1511–1532. DOI:10.5194/angeo-32-1511-2014. Retrieved on 2023-01-23.
↑ Tsugawa. "Medium-scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America", Geophysical Research Letters, 2007-11-22. Retrieved on 2023-01-23. (in en)

[1] B. Hofmann-Wellenhof (2001). Global Positioning System: Theory and Practice. New York: Springer-Verlag. ISBN 978-3-211-83534-0.

[2] ttps://books.google.com/books?id=9X5gy_mDamsC&pg=PA360 , eq.(25.5)

[3] van de Kamp (2014-12-17). "TID characterized using joint effort of incoherent scatter radar and GPS" (in en). Annales Geophysicae 32 (12): 1511–1532. DOI:10.5194/angeo-32-1511-2014. Retrieved on 2023-01-23.

[4] Tsugawa. "Medium-scale traveling ionospheric disturbances detected with dense and wide TEC maps over North America", Geophysical Research Letters, 2007-11-22. Retrieved on 2023-01-23. (in en)

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