Astronet > Forumy > Obsuzhdenie publikacii Astroneta

po tekstam po forumu vnutri temy

Mera dispersii
[fizika kosmosa]

DM - velichina, opredelyayushaya zapazdyvanie impul'sov izlucheniya na nizkih chastotah (dlinnyh volnah) po sravneniyu s vysokimi chastotami. DM ravna polnomu chislu elektronov na luche zreniya (ot ob'ekta do nablyudatelya) v stolbike secheniem 1 sm 2 : , gde N e - koncentraciya elektronov (kolichestvo ih v ed. ob'ema sredy), dl - element dliny vdol' lucha zreniya, - sr.

[Citirovat'][Otvetit'][Novoe soobshenie]

Forumy >> Obsuzhdenie publikacii Astroneta

Spisok / Derevo
Zagolovki / Annotacii / Tekst

>> Mera dispersii (N. G. Bochkarev, "Fizika Kosmosa", 1986, 29.03.2003 19:22, 2.9 KBait, otvetov: 13) DM - velichina, opredelyayushaya zapazdyvanie impul'sov izlucheniya na nizkih chastotah (dlinnyh volnah) po sravneniyu s vysokimi chastotami. DM ravna polnomu chislu elektronov na luche zreniya (ot ob'ekta do nablyudatelya) v stolbike secheniem 1 sm²:
$DM=\int\limits_0^L\; N_e\;dl=\bar{N_e} L$ ,
gde N_e - koncentraciya elektronov (kolichestvo ih v ed. ob'ema sredy), dl - element dliny vdol' lucha zreniya, $\bar{N_e}$ - sr. znachenie N_e, L - rasstoyanie do oblasti generacii izlucheniya. Obychno L izmeryayut v parsekah, a N_e v sm^-3, tak chto ed. DM sluzhit pk/sm³. Edinstvennym tipom astrofizich. ob'ektov, dlya k-ryh zapazdyvanie impul'sov poddaetsya izmereniyam, yavl. pul'sary.
Zaderzhka radioizlucheniya voznikaet iz-za togo, chto pokazatel' prelomleniya plazmy dlya el.-magn. voln zavisit ot $\lambda$ (sm. Dispersiya voln). Dlinnye volny rasprostranyayutsya medlennee korotkih. Poetomu signal, ispushennyi odnovremenno na raznyh $\lambda$ , prihodit k nablyudatelyu na dlinnyh volnah pozzhe, chem na korotkih. Velichina zapazdyvaniya:
$\Delta t_{1,2}={e^2(\lambda_1^2-\lambda_2^2)\over{2\pi mc^3}}\;DM\approx 4,6 (\lambda_1^2-\lambda_2^2)\cdot DM$ [mks] ,
gde $\lambda$ vyrazhena v sm. Obychno dlya pul'sarov 10 pk/sm² $\le DM \le$ 500 pk/sm³. T.k. nablyudeniya vsegda vedutsya v nek-roi polose dlin voln $\Delta\lambda$ , nalichie zapazdyvaniya meshaet izucheniyu tonkoi vremennoi struktury impul'sov pul'sarov i privodit k tomu, chto na ochen' nizkih chastotah prinimaemoe izluchenie pul'sarov perestaet byt' pul'siruyushim.
Osn. chast' DM nabiraetsya v mezhzvezdnom gaze. Poetomu izmerenie M. d. dast vozmozhnost' izuchat' raspredelenie elektronov v mezhzvezdnom gaze Galaktiki.
(N.G. Bochkarev)

Re: Mera dispersii (A. M. Chepik, 17.11.2012 10:34, 197 Bait, otvetov: 2) Formula zaderzhki vremeni otlichnaya, no tol'ko dlya malyh rasstoyanii. Neobhodima formula zaderzhki vremeni dlya mezhgalakticheskih rasstoyanii z>1 dlya raznyh modelei Vselennoi, v tom chisle Statichnoi.

Re[2]: Mera dispersii (I. A. Gryzulev, 17.11.2012 18:51, 46 Bait, otvetov: 1)
Nu i zavernuli Vy zdes', o chem rech' to?

Re[3]: Mera dispersii (I. A. Gryzulev, 17.11.2012 19:02, 31 Bait) Parsek, velechina iz fil'ma! out

Re: Mera dispersii (S. I. Kukrin, 2.03.2013 16:00, 282 Bait) interesno
Re: Mera dispersii (O. F. Sazonov, 10.11.2022 15:35, 177 Bait) Mne kazhetsya, chto v stat'e dopushena opechatka: "Obychno dlya pul'sarov 10 pk/sm2$\le DM \le$500 pk/sm3." Obratite vnimanie na stepeni intervala - v pervom sluchae kvadrat, a vo kub.
Top City Escort (rashikhanna rashikhanna, 30.11.2022 9:23, 366 Bait, otvetov: 1)
I like the obliging data you give in your articles.Bangalore Escorts ServiceI will bookmark your blog and check later on here reliably

Re: Top City Escort (rashikhanna rashikhanna, 30.11.2022 9:24, 842 Bait)

Quote:

I like the obliging data you give in your articles. Bangalore Escorts Service I will bookmark your blog and check later on here reliably

Top City Escort (rashikhanna rashikhanna, 30.11.2022 9:25, 183 Bait)
I like the obliging data you give in your articles.https://www.topcityescort.com/escorts/bangalore I will bookmark your blog and check later on here reliably
Pune Call Girls (poojasharma sharma, 23.01.2023 10:55, 1.0 KBait)
This article is good but there is one more article which you will like, I am giving its link in my comment box.
Pune Call Girls
Pune Escorts
Call Girls in Pune
Escort Service in Pune
Pune Call Girls
Pune Escorts
Call Girls in Pune
Escort Service in Pune
Gurgaon Men Looking Women (poojasharma sharma, 23.01.2023 10:57, 1.2 KBait)
I have read your blog it is very helpful for me. I want to say thanks to you. I have bookmark your site for future updates
Gurgaon Men Looking Women
Gurgaon Women Seeking Men
Gurgaon Women Looking For Men
Women Seeking Men in Gurgaon
Gurgaon Men Looking Women
Gurgaon Women Seeking Men
Gurgaon Women Looking For Men
Women Seeking Men in Gurgaon
Pune Call Girls (poojasharma sharma, 23.01.2023 11:02, 1.0 KBait)
This article is good but there is one more article which you will like, I am giving its link in my comment box.
Pune Call Girls
Pune Escorts
Call Girls in Pune
Escort Service in Pune
Pune Call Girls
Pune Escorts
Call Girls in Pune
Escort Service in Pune
Re: Delhi Escorts (shivanisingh shivani02, 20.04.2023 15:52, 544 Bait, otvetov: 1) There are many reasons a person might choose to visit an Saket Escorts Service. Escorts in Delhi are some of the most beautiful women you will ever see, and with so much to offer, it's easy to see why these girls enjoy such a high demand.

Re[2]: Delhi Escorts (shivanisingh shivani02, 20.04.2023 15:53, 737 Bait)

Citata:

There are many reasons a person might choose to visit an Saket Escorts Service. Escorts in Delhi are some of the most beautiful women you will ever see, and with so much to offer, it's easy to see why these girls enjoy such a high demand.