1 / 7

Condition for the life emergence?

We need to know the ancient Earth’s atmosphere (& Mars, Venus)  Estimate the history of atmospheric escape from data OR make guess from exoplanets or Titan. We need to know what kind of bio-molecules can be formed in different space conditions.

ariana-campbell
Download Presentation

Condition for the life emergence?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. We need to know the ancient Earth’s atmosphere (& Mars, Venus)  Estimate the history of atmospheric escape from data OR make guess from exoplanets or Titan. • We need to know what kind of bio-molecules can be formed in different space conditions. • We need to know the survival condition for bio-molecules & microorganisms in space. Condition for the life emergence?  Transport of life in space? (4) Understanding vehicle (asteroid, comet, meteor)

  2. Today, we exchange views of Plasma aspect Chemical aspect Biological aspect Be informal and informing way

  3. ------------------------

  4. Role of ionosphere in escape very little role essential role no example Ionopause pressure (PB) balances with both SW dynamic pressure (PD=swvsw2) &ionospheric plasma pressure PP (= ikTi)

  5. expected O/H ratio of escape #1) depending on relative extent of ionosphere and exosphere #2) because non-thermal > thermal for Earth-sized planet

  6. Formation of many pre-biotic molecules is most likely related to the amount and the oxidation state of N (NH3, N2, NOx) in the ancient Earth (Miller and Urey, 1959). • One cannot use the present abundance of N, O, H as the ancient value. • Abundance of N is quite different between planets • * Earth: 75% of atmospheric mass • * Venus ~ 2.5 times as much as the Earth (3% of Patom.Venus) • * Titan ~ 1.5 times as much as the Earth (98% of Patom.Titan) • * Mars ~ only 0.01% of the Earth (O is abundant) Need to add Nitrogen (& N/O ratio)

  7. Ionopause vs. EUV/FUV (major) • High ionopause during solar maximum for both Venus and Mars. • Frequent SEP (during solar maximum) probably caused high balance altitude by heating of the ionosphere.  The ancient condition is this extreme. Ionopause vs. SW/IMF (minor) • High SW PD decreases the altitude of pressure balance. (d) strong (stable) IMF  no change as long as SW PD > SW PB (e) variable IMF  lower balance altitude (by cancellation of B)

More Related