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Solar Radio Imaging Array SIRA

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Presentation on theme: "Solar Radio Imaging Array SIRA"— Presentation transcript:

1 Solar Radio Imaging Array SIRA
Interferometry 30 KHz MHz : need to go to space Microsat (16) Constellation Imaging Geoeffective Solar Disturbances from 2 Rs to 1 AU Large-scale structures

2 Radio Sky coronal Interplanetary Rs 1.5 2.5 20 214
Gap filled by Wind/WAVES But no imaging Type II, Type III bursts Type III storms are observed in the IP medium less complex Nelson & Labrum, (1985)

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4 An IP Type II & its CME 3.98 15.58 22.21 2.86 Rs f =0 .85MHz fp = MHz  n = 2.2x103 cm-3 when the CME is at 30 Rs Vcme ~ 770 km/s Type II bursts track CMEs through the IP medium SIRA will produce images like this at lower f

5 Type II burst and shock Type II bursts link the
Remote-sensed and in situ Data on CME-driven shocks

6 Type II in various Wavelength Ranges
DH Type II (no m) Type II in various Wavelength Ranges Metric Type II m-km Type II A continuum of properties decided by CME energy and VA of the ambient medium m DH km km type II DH Type II

7 CME Leading Edge at Type II Onset
Type II behind CME leading edge Type II & CME in different directions Incompatibility between IP and metric Can be accounted for if we acceleration Initially occurs in the Qperp region and later (IP) in the Q|| region (Holman & Pesses,1983)

8 Another Effect of the Medium: Radio Enhancement due to Interacting CMEs
Also observed by Ulysses and CASSINI ( 5& 9 AU) Direction finding consistent with LASCO position that the interaction occurs at ~20 Rs Gopalswamy et al. 2001;2002

9 CME Interaction CORE1 CORE1 CME2 CME1 CME2 CME1 Interaction Signature
20:42 21:18 CORE1 Interaction Signature CME2 CME1 CME2 CME1 1000 km/s Movie: oct-nov2003/031104_c3.mpg 2657 km/s 700 km/s

10 Interaction detected by Wind, Ulysses & Cassini
Cassini at 8.7 AU: Radiation has to travel for additional 64 min Data: M. Desch Wind: 21:10 1 (AU); Uly: 21:50 (5 AU); Cass: 22:18 (8.7 AU) II WAVES II III III Data: R, MacDowall Compare the upper and lower ends of the frequency range over which the CMEs are observed. II Cassini data confirms that the interaction signature is very strong III 11/04

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14 Mission Requirements ..\SIRA\SIRA Home Page at NASA-GSFC.htm

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