De dynamische Zon

De dynamische Zon
Eva Robbrecht
Koninklijke Sterrenwacht van
Belgie
Zon = kernfusie
+
+
+
+
1H + 1H --> 2H + positron + neutrino
1H + 2H --> 3He + foton
+
2
E=mc
+
+
Ceci n’est pas le soleil!
De zon is veranderlijk
Een revolutionaire ontdekking!
1613: Galileo’s systematische
observaties waren revolutionair,
maar controversieel!
The ancient Greeks, and other
Europeans after them, …[believed] that the
Sun and the heavens were ideal, an
embodiment of unblemished perfection.
The Aztec myth of creation involves a sun
god with a pock-marked face, which strongly
suggests that they had seen dark blemishes
on the sun.
1647: Hevelius
Magnetische cyclus
Zonnevlek-cyclus
Seizoenen op de zon
Zonnevlekken
voetpunten van de
magnetische lussen
Het magnetische tapijt
TRACE
SOHO
Zonnevlam
TRACE
Multi-observatie
2005/11/01 01:19
2005/11/02 01:19
2005/11/02 07:19
Complementaire observaties (!)
2005/10/30 10:30
2005/11/02 06:59
Coronala Massa Uitstoten (CMEs)
Halloween storm
CME (1)
CME (2)
CME afbuiging
Cremades, 2004
Afbuiging naar
evenaar tijdens
minimum
Klassieke foto van een CME
Probleem: van 3D naar 2D
>> Wat zien we eigenlijk?
CME in LASCO
= projectie 3D >> 2D
Cremades, 2004
Heliciteit
Helix = spiraal

Plasma ‘gevangen’ in magneetspiraal
Toepassing in de
kernfysica
Heliciteit blijft bewaard
“The magnetic field lines in the
magnetic cloud (shown in red with
a helical geometry) are unusually
very strong compared to the field
that exists in the surrounding
solar wind. That strong field is
part of the reason for the storm.
Also the dynamics of the cloud is
controlled by its strong magnetic
field and not by its internal gas
pressure.”
Marubashi
CME modellen
Een plasmawolk richting aarde
Communicatie
Poolvluchten kunnen enkel HF gebruiken boven 82º
Federal Aviation
Administration (FAA)
Radiation Alert
ALERT: Solar Radiation Alert at Flight Altitudes
Conditions Began: 2003 Oct 28 2113 UTC
Comment:
Satellite measurements indicate unusually high levels of ionizing radiation, coming
from the sun. This may lead to excessive radiation doses to air travelers at Corrected
Geomagnetic (CGM) Latitudes above 35 degrees north, or south.
Avoiding excessive radiation exposure during pregnancy is particularly important.
Reducing flight altitude may significantly reduce flight doses. Available data indicates
that lowering flight altitude from 40,000 feet to 36,000 feet should result in about a 30
percent reduction in dose rate. A lowering of latitude may also reduce flight doses but
the degree is uncertain. Any change in flight plan should be preceded by appropriate
clearance.
Satellieten en Astronauten
straling
Plasma
Hoog-energetische deeltjes
Atmosferische sleepkracht
Geinduceerde
stroom (GIC)
1848: Barlow was the first person
to make systematic observations of
the "Spontaneous Electrical
Currents observed in the Wires of
the Electric Telegraph“.
1989: Such a sequence of events led
to the Quebec blackout of March
13, which left the whole province
without power for over 9 hours.
Poollicht - aurora
The International Space Environment
Service (ISES)
Solar Influences Data analysis Center
SIDC
• Produceren van het international
zonnevlekgetal
• Opvolging en rapportering van
het ruimteweer.
• Voorspelling van het ruimteweer.
http://sidc.be
Invoed op het klimaat op aarde
Invoed op het klimaat op aarde