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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GWEZJMHOSHJYFQULH2OMBY7WLQXZALMZ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "GWEZJMHOSHJYFQULH2OMBY7WLQXZALMZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HLDEVYCTOPGPBDAXO6KJ5XLLN5VTUTAF/",
    "sender": {
        "address": "karn (a) philkarn.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Phil Karn",
    "subject": "[amsat-bb] Re: Malaysian airliner puzzle",
    "date": "2014-03-25T23:18:02Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5CPSWQPRZ6RLQ6A5D7Z3MFJFCEKNYZCF/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Finally, (some) technical details, though still not as many as I'd like.\n\nhttps://www.facebook.com/permalink.php?story_fbid=740971779281171&id=178566888854999&stream_ref=10\n\nThe original analysis was based either on a round trip time measurement\nor a reported transmitter power, which depends on satellite elevation.\nEither way, it could only yield a locus of positions that fell on a\ncircle of constant distance (or elevation angle) to the satellite.\nErasing the part of the circle that could not be reached with the\navailable fuel left the arcs. I don't understand why there would have\nbeen a gap between the two around the equator.\n\nThe big problem was to solve the ambiguity -- northern hemisphere or\nsouthern?\n\nI believe the answer relies on the fact that Inmarsat 3 F1 is an old\nsatellite launched in 1996. Its inclination has risen to 1.67 degrees,\nprobably because its stationkeeping fuel has run out.\n\nThe total measured Doppler would be the sum of the Doppler caused by the\nplane's motion with respect to the satellite and that due to the\nsatellite's non-zero motion with respect to the earth. Judging from the\ndiagrams on heavens-above.com, I'd say the satellite was moving\nsouthward during the flight, which took place between roughly midnight\nand dawn local time. Since the plane was in the southern hemisphere, the\nsatellite was moving toward it, resulting in a higher net frequency\nshift than if the plane had been in the northern hemisphere.\n\nNote the shapes of the curves in the plot titled \"MH370: Burst Frequency\nOffset\". The southerly track has the Doppler increasing with time, while\nthe northerly track would have it decreasing with time.\n\nThe analysis does have to assume a certain fixed speed for the aircraft\nbut it seems to produce consistent results.\n\nIt should be possible to replicate Inmarsat's graphs using the three\nline elements for the satellite and their presumed ground tracks for the\naircraft.\n\nPhil\n\n\n",
    "attachments": []
}