Solar radio monitoring at nan ay observatory spectrography and imaging
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Solar Radio Monitoring at Nançay Observatory - spectrography and imaging. K.-L. Klein, A. Kerdraon , A. Lecacheux ( ludwig.klein@obs p m.fr ). At dm-m- λ radio waves : Electron beams rising from the low corona to IP space (type III; r ≈ 1.1 R  -1 AU)

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Solar Radio Monitoring at Nançay Observatory - spectrography and imaging

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Solar Radio Monitoring atNançay Observatory -spectrography and imaging

K.-L. Klein, A. Kerdraon, A. Lecacheux

(ludwig.klein@obspm.fr)


At dm-m-λradio waves:

Electron beamsrisingfrom the low corona to IP space (type III; r ≈ 1.1 R -1 AU)

Shockwaves in the corona and IP space

Confinedelectron populations as tracers of CMEs (type IV)

Space-weather relevant processeswhere radio spectrogaphy and imagingprovideearly information !

Radio monitoring of the eruptive Sun

What do wesee ?

Type III

(e beams)

Wind/WAVES

Type II

(shockwave)

Nançay DA

Kerdraon, Pick, Hoang, Wang, Haggerty 2010 ApJ 715, 468

Type IV

(trapped e)

ARTEMIS

Nançay RH

Solar Radio Monitoring at Nançay


At ≥ dm-λwaves: emissionatν~νpe~√ne

Propagating exciter in a quasi-staticatmosphere or expandingloops (CME):

Characteristicshapes of the radio burstspectra:

Radio monitoring of the eruptive Sun

What do wesee ?

Type III

(e beams)

Wind/WAVES

Type II

(shockwave)

III

II

shock

e beam

Nançay DA

trapped e

Kerdraon, Pick, Hoang, Wang, Haggerty 2010 ApJ 715, 468

Type IV

(trapped e)

ARTEMIS

Nançay RH

Frequency [MHz]

IV

Solar Radio Monitoring at Nançay

Time (altitude)


2007 May 19: SEP event (STEREO)

Whydoesthispoorlyconnectedsolaractivity(EUV: W05°) emitSEPsdetectedatEarth (Parker spiral W38°) ?

Radio imaging (NRH): because the energeticelectrons (particles in general ?) are releasedwellwestward of the parent AR (shock and open flux tube geometry) !

Radio monitoring of the eruptive Sun

What do wesee ?

Type III

(e beams)

Wind/WAVES

Type II

(shockwave)

Nançay DA

Kerdraon, Pick, Hoang, Wang, Haggerty 2010 ApJ 715, 468

Type II

Flaring AR

ARTEMIS

Nançay RH

Type III

STEREO + NRH

Solar Radio Monitoring at Nançay


Solar-dedicated radio instrumentationNançay Observatory

space

Spectral identification of mapped sources

  • 2 historical instruments:

    • Radioheliograph (NRH; 150-450 MHz;onlysolar-dedicated imager atdm-m-)

    • DecametreArray (NDA; 20-70 MHz; unparalleledsensitivity and data quality; new digital receiver)

  • New spectrograph: ORFEES, completesspectrographiccoverage to 130-1000 MHz, including NRH frequencies (since 2012; coop. French Air Force)

  • New extension of NDA to 5 MHz: continuouscoverage to space-basedobserva-tions (Wind/WAVES, STEREO/SWAVES; since 2012)

Nançay

Solar Radio Monitoring at Nançay


Solar-dedicated radio instrumentationDistribution of Nançay data

  • Solarmonitoring data: BASS2000 (http://bass2000.obspm.fr/)

  • SEPServerproject: Particle and EM data for SEP events (server.sepserver.eu)

  • Release of SEPServerthisafternoon, splinter meeting 17:15-18:45, Scala 3 !

  • Radio-dedicateddatabase, in relation with STEREO/SECCHI (http://secchirh.obspm.fr/):

    • Spectrographic data Nançay, ARTEMIS (Greece), Wind/WAVES, STEREO/WAVES)

    • NRH overviewmovies

    • Underway to 24 h coverage in radio spectrography (Kunming, Culgoora, …)

Solar Radio Monitoring at Nançay


Solar Radio Monitoring at Nançay Observatory

Summary & conclusion

  • Radio observations of solareruptiveactivity trace potentiallygeo-effective dynamicalphenomena in the corona: escapingenergeticparticlebeams, shockwaves, CMEs (on the disk or at the limb).

  • Spectrographic data are availablefromseveral stations in Europe and worldwide (cf. CESRA websitehttp://lesia.obspm.fr/cesra/).

  • Somecanbedelivered in real time.

  • Nançay: unique complementary data set in spectrography (5-1000 MHz – continuation of spaceborne observations < 14 MHz) & imaging (150-450 MHz) in the corona up to ≈1 Rabove the photosphere.

  • Data provision for research(http://secchirh.obspm.fr/) and spaceweather applications (FEDOME spaceweatherdemonstrator, French Air Force).

  • Data available for future common services in Europe (cf. Spa. Sit. Aw. questionnaire)

Solar Radio Monitoring at Nançay


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