Dream Team Meeting1/25-26/10 Dream Team Meeting1/25-26/10.

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Presentation transcript:

Dream Team Meeting1/25-26/10 Dream Team Meeting1/25-26/10

Dream Team Meeting1/25-26/10 Event Selection Criteria Well-studied event LP or other lunar plasma data available Upstream energetic particle data available Ground-based data available EUV data available “Interesting” sputtering/ion-enhanced-PSD inputs High alpha/proton ratio Heavy ion fluxes

Dream Team Meeting1/25-26/10 Starting Point: Plasma Data Kaguya had best plasma data, but no extreme events! So, looked for events during LP mission Electron Energy Spectrum High Energy Electrons Frequency of >500 V charging SEP Events Magnetotail Passages

Dream Team Meeting1/25-26/10 Many Well-Studied 1998 Events Event Periods #1,3,5,6,7,10,11 are flagged as Solar Particle Events that affected the terrestrial environment by NOAA All events have extensive plasma data from upstream assets (Wind, ACE, SOHO) and at GEO Event Periods #3 (May),#6 (August), and #7 (September) are ISTP Sun-Earth Connection Events Extremely well-studied

Dream Team Meeting1/25-26/10 April & August 1998 Low energy and energetic electron fluxes, energetic ion fluxes, spacecraft potential, and lunar surface potential Note the clear orbital modulation as LP (in polar orbit) passes through the lunar plasma wake

Dream Team Meeting1/25-26/10 September/October 1998

Dream Team Meeting1/25-26/10 May 1998

Dream Team Meeting1/25-26/10 Other Factors High alpha/proton ratio for May, August, September events Have NOT Checked EUV Availability No ground-based data available during SEP event and during LP mission May Sep

Dream Team Meeting1/25-26/10 Recommendation: May 1998 Extraordinarily complicated time period Multiple flares, CME shock passages, magnetic clouds, SEP injections Should have something for everyone

Dream Team Meeting1/25-26/10 More on May 1998 Extensive library of references available Lots of interesting studies of this event time period For example, Skoug et al. at right looked at ratios of He+ and He++ during magnetic cloud passage Could be very interesting for sputtering etc.

Dream Team Meeting1/25-26/10 May 1998 Charging Modeling Model Data

Dream Team Meeting1/25-26/10 Caveat These events have everything Great, because you can look at everything under the sun Bad, because they are complicated to interpret Suggestion We model simple idealized cases first 1. Flare (just UV) 2. Shock passage (just B, n, T change) 3. SEP injection (just energetic particles) Multiple composition, time profiles? Then, tackle the big one

Dream Team Meeting1/25-26/10 Extra Slides Follow

Dream Team Meeting1/25-26/10 Complexity of Events Reames,1999

Dream Team Meeting1/25-26/10 Modeling Surface Charging Find potential which ensures current balance between electrons, ions, secondary electrons, and photoelectrons (dayside only) Lack measurements of low-energy ions Assume T i =T e,n i =n e Use LP data to estimate secondary emission coefficents J e (U) + J i (U) + J s (U) + J ν (U)= 0

Dream Team Meeting1/25-26/10 Aug Charging Modeling