logo ČAS

Česká astronomická společnost

Registrace k odběru novinek
Domů ČAS Články Akce Obloha Download Rady Media Kontakt

Snímek dne
« 2019.05.24

«  květen 2019 
  Po Út St Čt So Ne
    1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31    

Oblíbené
Klíčová slova
   Video
   Animovaný gif
   Mouse over
   Anaglyf
   Interaktivní
   Java applet
Měsíční kalendář
Archiv
O APODu

Index (en)
Glossary (en)
Education (en)
Discuss (en)

RSS - dnes
RSS - týden

Internet astro.cz

Astronomický snímek dne (APOD)

30. listopad 2001

Vzhled a zvuk meteorického deště
Vzhled a zvuk meteorického deště
Uznání a copyright: Paulo Raymundo (Reaiche Observatory)
animation courtesy Tony Phillips (SpaceWeather.com)

Popis: This dramatic four-frame animation shows a fireball meteor and its developing persistent "smoke" train, recorded two weeks ago in skies near Salvador, Brazil. Indeed similar sights are astonishingly familiar world-wide to witnesses of this November's fireball-rich Leonid meteor storm. A few skygazers even discovered that some bright Leonid fireballs made faint, gentle, hissing sounds(!), a surprising effect only recently appreciated and understood. Accounts of fireball meteors making noise have long been viewed with skepticism, particularly because sounds were reportedly heard just as the meteor was seen overhead. But light travels much faster than sound so, like delayed thunder from a distant lightning stroke, a meteor produced sound should only be heard long after the meteor streak was seen. A sound explanation supported by laboratory tests is that turbulent plasma created by the meteor's passage generates very low frequency radio waves. Traveling at light speed the radio waves reach the ground simultaneously with visible light where they are strong enough to induce oscillating currents and audible vibrations in common objects like grass, leaves, wire-frame glasses, and perhaps even dry, frizzy hair.

Klíčová slova: animated gif, fireball, Leonids 2001, sound

Originální text (anglicky)

Předcházející: Koronální vtok Následující: Neptunova velká tmavá skvrna: Je pryč ale není zapomenuta


Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA) ; česky Josef Chlachula
NASA Official: Phillip Newman Specific rights apply. NASA Web Privacy Policy and Important Notices A service of: ASD at NASA/GSFC
& Michigan Tech. U.