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 ( [email protected] 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 at nan ay observatory spectrography and imaging

Solar Radio Monitoring atNançay Observatory -spectrography and imaging

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

([email protected])


Solar radio monitoring at nan ay observatory spectrography and imaging

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


Solar radio monitoring at nan ay observatory spectrography and imaging

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)


Solar radio monitoring at nan ay observatory spectrography and imaging

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 radio monitoring at nan ay observatory spectrography and imaging

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 radio monitoring at nan ay observatory spectrography and imaging

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 nan ay observatory spectrography and imaging

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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