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S/WAVES Impulsive Signals: Possible Interplanetary Dust An update

S/WAVES Impulsive Signals: Possible Interplanetary Dust An update. M. L. Kaiser, K. Goetz, C. St. Cyr, R. Howard. DMSP/GPS Behind. New software uploaded Did NOT cause impulses to stop. Periodic, too!. Adapted from Wang et al., Plan & Spa. Sci., 54 , 957-966, 2006.

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S/WAVES Impulsive Signals: Possible Interplanetary Dust An update

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  1. S/WAVES Impulsive Signals:Possible Interplanetary DustAn update M. L. Kaiser, K. Goetz, C. St. Cyr, R. Howard

  2. DMSP/GPS Behind New software uploaded Did NOT cause impulses to stop

  3. Periodic, too!

  4. Adapted from Wang et al., Plan & Spa. Sci., 54, 957-966, 2006.

  5. 17 SECCHI HI-1A compound debris events • 100% correlation with S/WAVES impacts

  6. Grün’s Interplanetary Dust Distribution at 1 AU Grün, E, et al., Icarus, 62, 244-272 (1985) The BIG problem Observed flux Implied mass

  7. Summary • S/WAVES observes impulse-like signatures consistent with dust impacts • Most prominent on Ahead • Weaker and less frequent on Behind • Most prominent on antenna closest to ‘ram’ direction (X on Ahead, Z on Behind) • Most events consistent with 1-10 micron sized particles • Occurrence in ecliptic longitude consistent with known wire antenna breaks • Sharp onset at ~309° observed by Ahead, GPS/DMSP, and Behind • S/WAVES impulse signatures coincident with ‘debris’ observed by SECCHI • SECCHI debris ~20 times as prevalent as on SOHO • Apparent 100% correlation with S/WAVES events • Implied mass and flux during active sectors much higher than Grün distribution • In general agreement during inactive sectors

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